I've not had visual disorientation when flying in IMC, but I limit myself to short glances when I think there's something to see (often out the side window in front of the wing, as vertical visibility is much better than horizontal). My CFII made sure that we shot some approaches on a medium-low ceiling day with an irregular bottom. I stayed on the gages and took occasional peeks out front during the breakouts, as the ground / runway came and went out front.
On the other hand, I have had the leans. The worst was when tops were forecast 1000-1500' below my 9000' cruise altitude, but ended up with bottoms at 8700 msl. Leveled off on the gages and had a very difficult time believing that I wasn't making a descending left turn; think I managed to stop around 9200-9300; ATC asked if there was a problem while I was easing right and trying to descend, all in a hard sweat. I knew the gages were right, but it was hard to act on them. Only lasted a minute before everything cleared up. Next time, I'll try the closed eyes, lean back, lean forward, forehead smack thing and see if it works.
Ya'll fly safe out there!