I had also made the same mistake. I pre ordered a 6 plus through AT&T & had an expected shipping date of 11/9-11/27 and that was just ridiculous. My iPhone 5 was literally on its last legs and there's no way I could continuing waiting. Also,a week after I had pre ordered the 6 plus I went to see the phones in person and discovered that the 6 plus was way too big and not what I wanted. so I had cancelled my pre order and was able to pick up a 6 at best buy. in my area the 6 seems to be easy to pick up from store than the plus. The 6 has great battery life for me since I also had an iPhone 5 that had the battery issue. I would start off from my house at 100% and my college is an hour away from where I live and I would already be at 68% without even barely using it. With the 6 I'll leave my house at 100% and by the time I get to school it would only be at 96%. So I'm very happy with my decision
I am in the same boat, I ordered the 6+ on 9/19 and they told me a shipping date of 11/9-11/21 and I just can't believe its THAT LONG, but my current iP5 is running fine, it just has a horrible battery (have to charge it 2-3 times a day), so I CAN wait that long, I just don't want to.
I also do not like bulky cases on my phone (OtterBox Defender), I am more of a screen protector and slim case to protect it from scratches and whatnot, I work an office job so I don't worry about doing manual labor with my phone.
I went to Best Buy again last night and played with both phones, but its really hard to get a real sense of the phones because they have sensors and wires attached to them, and I also couldn't put it in my pockets to see how it felt.
I think I am going to stick with my original order for the 6+ and just wait it out because to me the screen, battery and camera hardware are worth the wait and size...