It takes some practice to play the longer scale, but not difficult. My hands just knew where to go on the strat, but I have to think about it on the new one, and sometimes I still miss when playing fast. Its only been 3 weeks, so it is not insurmountable.
The biggest difference, to me, is the width of the fret board. When playing a bar 7th chord in the A position, I frequently miss the 2nd string with my pinky. Just some practice needed.
I have small hands, so I can't tell you about if bigger is better....