Any class at level 18 can be pretty simple. When you get higher level you'll find you'll have more options for attack abilities dragonkick vs. bootshine, true strike vs. twin snakes, snap punch vs. demolish. depending on the situation, you'll be using different abilities at different times. On top of choosing between two abilities to use for each part of your combo you will also need to reposition yourself based on the ability you are using. Monks also need to watch their dragon kick debuff, greased lightning stacks, twin snakes buff, demolish, fracture, and touch of death you want to keep all of those buffs, debufs, and dots up. you may also start sticking in impulse drive at higher gear levels.

The rotation itself can look overwhelming at first, but eventually it becomes muscle memory. the real trick to monk is positioning and juggling, especially juggling. if you drop a debuff, buff, or dot it can hurt your dps. Although I will say, given that there's 6 abilities in the normal rotation and depending on the fights and etc... i would not recommend using macros for normal rotations, heck i never recommend using macros for actual rotations ever.