I flip back and forth with it. I like the Zoomed version better for larger items and larger landscape keyboard but at the same time I feel the Standard mode works better with iOS8 at the moment.
I thought I would like the landscape homescreen but to be honest, I don't. I use my phone in Portrait mostly. Sometimes I turn it landscape to type out two handed messages. I am not as big of a fan of the two sided notes, email, etc... on the 6+. It doesn't help that I've been using an iphone since the 3G model came out and we didn't have these features on it. I do use my ipad rmini in both landscape and portrait so it is hit or miss with me. I think I just haven't adapted to it yet. Eventually I will settle on one or the other.
I also do not like that the homescreen may be upsidedown when I take the phone out of my pocket so I have to wait for it to turn. In Zoomed mode I don't have to wait for that. No I don't want to turn on rotation lock since that works for everything, not just certain specific apps like the zoomed mode.