Bard is still one of the easiest to play. The rotation of blm is fairly simple but their are other components to the class that make it more involved then playing Bard.
Ninja is fairly simple as well and is rather fun, at least to me. Dragoon and Monk i would say are more involved as would be summoner (if we are talking optimal rotations here)
Also perhaps a tank class may suit you? While i have yet to level warrior just maybe that could be another potential.
I do wish you all the best in your journey