I love 3D terrain but don't use it much either. I'll sometimes throw in some half-terrain though, just to spice things up. I've never played with full Dwarven Forge though, but would love to try it.I use a battlemat or other 1" grid map, and minis, usually painted. Here's my last Princes of the Apocalypse session: 20/M6 1491 DR session 7 Lvl 5 RL6 Scarlet Moon Hall 2 XP 37+7=44 - the dorky standing guy with die in hand is me.
I rarely use 3D terrain as I'm usually GMing at pub or someone else's house; this game was at my flat, the boys are my son & a friend's son.