Using less redstone isn't an issue for most people in this version of the game. Redstone is far more abundant than there are uses for it. There are of course other ways to make your minecart go up hill. Locomotive minecart is an option, but it's slow
and uses coal. There is also the bug that lets you create a booster by running along side another minecart. But powered rails are the way to go here.
Guess most people on here aren't as much of a redstone lover as I am. Once pistons come out I'll need all the redstone I can get so levers are the way to go for me, at least. Going to be really bummed if BUD switches don't work in the xbox version.