When I first was able to do 3d I enjoyed it much more than 2d. It felt like a new dimension had opened up to me, no pun intended. :)
But it was a double edged sword - an extremely painstaking and frustrating art form back then, it still is to some extent although 10,000 times faster and more interactive today, still there's the constant struggle to keep up with accelerating changes. Add in some kicks in the groin by life, and I quite simply burned out on 3d. I retreated back to my 2d roots.