I don't trust elevators... they're always up to something!
Elevators allow you to create seamless builds without the need for stairs or ladders. If you want to go down a level, hold shift while on the elevator. If you want to go up a level, jump while on the elevator.
By simply placing a redstone block underneath another block of the same color, you can make an elevator. Keep in mind, they have to be directly below or above one another, and can't go past 40 blocks.