Titan swaps always seemed overkill to me, at least for what I'm doing. Yeah, you get the extra articulation, but I've yet to not have enough travel on the trails I run. I know there are people out there that put that mod to good use though.
My big issue with the Titan swap is the width. Sure, for the most part it's not going to stop you getting down a narrow trail. I've been on a few where it would be super tight if you were swapped though. And I hate the idea of having that much more width for one reason: mud. When you drive through mud on a stock width setup, mud goes flying into the inner fenders and sticks there. It sucks to clean out, but it's not too bad. If you're on a Titan swap, every time you go through any mud or puddles, all that mud will completely cover the side of the truck. Blackdawg has mentioned that to me about his long travel Taco. Plus like the above poster said, having your arm out the window would suck.