I never held in the real world, except for IX's... and holding at the boat.
Here, I have had to do it 3 times in the last week because ATC is over-freaking-whelmed. If the airspace in Corpus and Pcola are not good arguments for having MORE training bases that are no 20 miles from 2 more, I I don't know what is.
I have held waiting for emergency traffic to clear the runway, other than that, not so much other than practice. Nice thing about flying the big white sleeping pill was just punch a couple of buttons and the plane does it all by itself, it even draws a nice picture of the holding pattern and entry on the giant moving map display. You can devote all those holding brain cells to higher tasking.
Here at NSE, we are VFR about 75% of the time that we practice holding, so the airspace/controller thing really isn't an issue very much. About half the time we aren't even talking to anyone but ourselves. Good times.