No worries! In my mind, there are only a few situations where I feel the 15" rmbp is particularly worth it (for developers):

1. If you're offsite far more than you're onsite.

2. If you need >8 GiB of RAM.

Of course, if you expect to do much gaming on your laptop, you may want a laptop with a dGPU. *8-)

I actually am offsite a lot more than I am onsite at the moment, and maybe for the next couple months. I bought the low-end 15" rMBP to test it. 1920*1200 actually provides a lot of real estate while being quite usable. I'll see within the next two weeks how much it can increase my productivity. But it is really heavy.

Agreed on the gaming part. But one wouldn't buy a Mac to play games lol.