I've hiked into DV many times from the trailhead at Emerald/Eagle. Never made it all the way to Talac - usually take my pole and hit some of the small lakes 3-4 miles in.
Hmmm...I don't fish so very often so that might explain why you prefer Tahoe over Yosemite.
There is definitely a greater variety of things to do in Tahoe. You have the beautiful lake, swimming, fishing, waterskiing, jet-skiing, cruises, gambling in the casinos, restaurants, hiking and camping and first class ski resorts in the winter.
However, Yosemite has Happy Isle trails, which includes Bridal Falls, Nevada Falls and the 900 foot wire-rope climb up to the summit of Half-Dome. It also has Yosemite Falls, El Capitan and the Merced River travelling the length of Yosemite Valley. Those 8,000 foot sheer granite cliffs are spectacular. Remember Ansel Adams spent most of his time photographing Yosemite, not Tahoe.
However, I love both places -- for different reasons.
The next time you are in Yosemite climb up to the summit of Half-Dome. Then drop to your belly and skootch over to the ledge. Then hang your head over and look straight down. It is practically a spirtual experience. Or maybe that is the feeling you get when you think you are about to die. ;-)