I got both the 6 and 6 Plus right now. Every time I pull out the 6 out of my pocket I can just use it like a regular iPhone. Every time I pull the 6 Plus out of my pocket I instantly notice the inconvenience and have to think about working around it; like trying to focus while taking a picture in one hand. IMO keep the 6.
I agree it's interesting that you never see anyone with a 6 Plus IRL but that's probably for good reason.
I own both and agree with the plus feeling more inconvenient. For me though, the battery is still too tempting. I'm a heavy user with a job that has me walking around a ton and no time to plug in from as early as 5am to 10pm daily. Today with my version of light use on my 6, I'm already at 80%, and still have a long day ahead of me. Makes the decision a lot harder.