2 things: 1) About smarter people, this is really awesome indeed. I was used to be around the same people for 4 or 5 years (college and my company) then when I started my masters degree I've got in touch with people with 2x my experience, and really smart people. The discussions there are in a whole different level, the classes are actually a fun time, it's just amazing.
2) about the one goal, I'm gonna try this right now! We all hear about this but I myself have never tried it. It seems quite impressive the power of having just one single goal for 1 year