I think it's varied based on classes. A Barbarian or a Rouge play very straightforward - hit things, then hit them again.

For classes like wizards, you suddenly have a ton of options in your disposal, and they all use the same resource (spell slots)

I think it's easier when you have a lot of abilities that simply go into a cooldown (usually Short or Long cooldowns). That means using one doesn't come at the expense of the other abilities that you have.