OP, I'd play with the 6+ for a few more days before exchanging it. I haven't picked up my 6+ yet, but like others said, you'll probably get used to it. When I went from the 4S to the 5, it was awkward to me at first because it was taller and thus, harder to reach the top corners. But I got used to it eventually, and it was no longer an issue for me. There's always a learning curve when there's something new. I pre-ordered the 6 at first, but changed it to the 6+ because I didn't feel like it's much of an upgrade from my current 5s. The 6 was only 38% more pixels than the 5s, but the 6+ is 185% more pixels. You just can't resist that giant screen. And LogMeIn will be so much more pleasant to use on the 6+.
Will find out how giant the 6+ is when I pick up mine up tomorrow. Have you considered switching your 6+ with your wife's 6? Maybe you guys can change it up from time to time to keep it exciting? Just a thought. Good luck with your decision.
