Yes you can see the ocean along parts of A1A. I don't recall a lot of stop lights -- certainly fewer than you'd find on Route 1.
Taking the Turnpike down to Vero isn't bad -- especiallly if you are starting from WDW (instead of the airport). The only hitch is the State Road 60 that takes you across from the Turnpike into Vero. This is a heavily traveled, two-lane road through desolate ranchland with ditches on either side until you get very close to Vero. You do encounter trucks and, I imagine, could also meet farm equipment. On a nice clear day it is an excellent option. At night, or in a terrible thunderstorm, I'd think twice. State Road 60 is also where the big mall, the outlet center, and other shopping centers are located. You'll also need to get directions to the resort coming back up from the south. Basically, you just find your way over to the coast, A1A and head on up to the resort (which is really in Wabasso rather than Vero proper).