And I've got ~50 years of experience with long guns. Any weapon that requires more than merely 1) picking up the gun, 2) pointing/aiming the gun and 3) pulling the trigger is a terrible choice for a gun owner like the OP. In a panic situation he's just not going to remember everything he has to do. 1) Pick up gun. 2) Find the safety. 3) Try to remember which way the safety goes. 4) Disengage safety. 5) Point weapon. 6) Pull trigger. 7) Remember to pull forearm back to eject spent round. 8) Etc.
A revolver is the only choice for such people.
BTW, this is one of my bedside weapons. It started as a standard Rem 870 Express HD. I replaced the stock w/a Knoxx so as to increase it's portability/maneuverability. Then I decided to try to increase its versatility by replacing the 18 inch HD barrel with a 20 inch turkey barrel. I'm going to use it for turkey, varmint and HD.
It's still a massive gun, regardless. It's loaded with 00 buck. Someone might suggest that with that choke there's not going to be any spread. To that I would say they should actually pattern a shotgun. At across-the-room distances, there's not going to be much spread anyway. That holds true for your argument re revolver vs shotgun. If you don't believe it, pattern your open choke 18 inch barelled shotgun at say, 10 or 12 feet.
I also have a Glock 19 with tac light in my bedstand. Also in my bedstand is my everyday carry piece, a Sig 239 DAK SAS.
If I have to clear the house, I use the Glock that is alternatively loaded with hollow points and solid points. Solid points for penetration (in case bad guy has lots of clothes on) and hollow point for expansion. 
"Any weapon that requires more than merely 1) picking up the gun, 2) pointing/aiming the gun and 3) pulling the trigger is a terrible choice for a gun owner like the OP" I think we're having a productive and civil debate for a thread on 1st time home defense gun use.
There are many common features between various types of guns and many legitimate preparatory states to store a handgun or shotgun for home defense. What you stated in the quote above does not exclude using a shotgun as you well know. The means of deployment are dictated by each situation - like the limitations of the user, untrained children in the home, alert lavel, home layout, etc. (I know I'm preaching to the choir, but for the benefit of the 1st time owners).
Most handguns and shotguns have a safety. It can be locked on purpose or by accident due to lact of training.
With a double action revolver, it can be uncocked, on safety, and 2nd chamber empty for safety reasons. It can be cocked, clambered, and off safety if the homeowner is on high alert - or something in between.
A shotgun or semiauto handgun owner can choose to keep the safety off and the round unchambered - requiring "cocking". Or they can keep it cocked, off safety, with a round chambered. I'd say that fits your readiness criteria, but obviously not very smart.
My Smith .44 has a safety and it's double action. So I can have the gun uncocked with the safety off and a round chambered - ready to fire. Or, I can have it cocked with a round clambered ready to fire, but on safety - like most semiautos. I may want to have the hammer cocked and the safety off if I'm really paranoid. Or I can leave the 2nd chamber empty so someone doesn't find the handgun and fire it with the 1st pull of the trigger.
My semiauto Colt .380 has a safety but it's not double action like a PPK, so I need to keep a bullet clambered and on safety if I don't want to require pulling the hammer or racking a round before firing.
After saying all this, the bottom line is - there are several common features to both hand and long guns. It gives the owner options needed for their particular situation. There are always tradeoffs. It's best to start with the most fool-proof solution - learn, train, test scenarios (especially for undesirable outcomes like neighborhood kids rooting through your bedroom, or shooting through walls), then alter accordingly.