The more you use primes, the more you'll appreciate them. I've been shooting 3 primes, Minolta 20mm f2.8, 35 f2, and Sony 50mm f1.4 and it's a great setup for me as I get extreme light gathering and they are light weight. Yes there's 3 lenses but I usually have my 35 on my a900 for most shots. Plus you get to walk around to zoom in instead of standing still and zooming in. Get a lot better shots too. I recommend picking up the 35 1.8 too and try to use those lenses exclusively for a little bit and see if you notice yourself trying to get different compositions. It definitely works. Ive learned a lot on composition just by being forced to get different angles to get a shot with the primes.
Congrats on the new lens, you'll enjoy it!!