I just got my last month and I love it.
1) is it easy to use? i'm afraid when/if i get one i'm going to be confused with a lot of aspects on how to use it (LOL)
Yes it is very simple, you may just confused with some keys, command key, control, how to right click, etc, but you easily learn and if you need help you can easily find guides online.
2) is an extra 2 inches worth $700? (13 inches being $1.3k w/ minimum gb / 15 inches being $2k w/ minimum gb)
Well for me it's not really worth the extra 2 inches, but to others it' is.