The problem with larger drives is, one scratch of the needle, and a lot will disappear. I have seen 1TB drives out long enough to agree they are stable to run, but I seemed to find disagreeing reviews on Newegg about most 2TB drives. When I bought my USB external, I got a 2x1TB instead.
I'm just wary of a 3.5" 2TB drive overall, unless you mirror it on another one. Even then, 5 years later, you might be cursing about everything if something goes wrong. A bad power down or just overall wear-and-tear might mean the end. And while the freezer trick works for so long, it'd be hard to pull 2TB of info off of it before the metal heats back up and expands again.
I know this is a personal opinion, but I just say that buyer beware. This might still be too "new" to know how well they last.