Yes but for me, no. When you're always having to get on flights, even the bus, the 15" is a PITA.
I definitely agree that the 15" is the best value model to go for, but as someone who has spent the last few weeks doing a lot of traveling with a MBP, I grew really weary of the form factor when using it on trains and planes!
I love the extra screen size on the 15, especially if you're working all day from the laptop. And it is a nice neat package compared to old designs, but it is a bigger footprint.
The 13 is still a very capable machine, so I wouldn't go chasing specs unless you need the most powerful machine you can get.