Don't let it intimidate you! My gf has a 5s and always called my plus a phablet. Recently her phone started acting up, so T-Mobile gave her a 6 plus as a loaner phone. She actually quickly became use to it and preordered the 6s plus last week and got it in yesterday. So far, so pleased.
When the 6 plus came out, I let the size freak me out and then realized the 6 was not the way to go at all. This year I'm more than please with the 6s plus. It feels nice in the hand because it has a different finish and it has the added weight, which I like.
I tried to use a 6s I ordered the other day and I put it right back in the box and put it in my drawer.
I really miss OIS and with a camera so beautiful and 4K video, I'll stick with using the 6s plus.