The last time I saw a 3-D comic was in the summer of 1966, when DC issued a large format black and white reprint of an issue of Detective Comics, with attached 3-D glasses, which had originally been published as a Batman 3-D book back when the first 3-D craze of the fifties was petering out. I'm sure the work you did for Kitchen Sink was more advance, because while the book did have the illusion of a great depth of field, each panel looked like two-dimensional drawings on two or three different planes. I vaguely remember the Captain 3-D book being superior to the Batman 3-D book back in the day, and an EC 3-D horror book being rather disappointing.
Personally, I don't think 3-D is the wave of any future and I see it as a novelty, an amusing novelty but just a novelty. I'll also admit that I have not seen any of the new spate of 3-D films, although I would like to see one out of curiosity (I'm a full-time caregiver, and going to a movie theater where we live is just not feasible for my wife). I'm sure the technology has advanced a great deal, but I expect audiences to tire of it fairly soon. I probably should note that, in retrospect, I've generally been a poor prophet.