“and then when 10-15 miles out descend at 5-6000’/min”
No. It is EXTREMELY unusual for an air carrier or general aviation aircraft to descend at five or six thousand feet per minute anytime on a normal flight. In fact, due to slower speeds in the terminal environment, the vertical speed slows. Typical rates of descent on an instrument procedure vary from six hundred feet per minute on a precision approach to one thousand feet per minute (briefly) on a non-precision approach.
It’s NORMAL here ... they bring them down FAST to about 2000 above the glideslope at the outer marker,, then you power up to keep from going through it ,,, at MCO you generally take off and land southbound , 4 runways , 2 17/35’s and 2 18/36’s ,, all 10k’ plus...
I had a EMB120 blow an engine above my house a few years ago ,, you could hear on the ground that he accidentally went into beta while at speed.
I think they do it so that the aircraft taking off have vertical separation ,, they turn a lot of them north after takeoff and they’re limited on the paths they can use ,, DISNEY WORLD has it’s own permanent “NO FLY” zone just to the west...