Yes, my partner uses the iMac 27 for web page building and graphic design work. No moving parts, and it uses very little power, so that's a plus.
I'm just on a HP laptop. It's set up for video editing, but otherwise unimpressive.
Pretty sure the son has a 1600 watt power supply for his gaming machine. Might be more now. He calls his tower "the Beast", and it does look very impressive.
Pretty sure he likes to push things to the very limit, and he sounds kind of chuffed when he's the first among his friends to destroy a new graphics card.
He's now finished his Bachelor of Gaming (can you believe that?) and has released several free games for the android platform.
Working on crowd-funding his latest concept game for the PC.