Is BLM truly simple?

[DxWings]

Folks, folks. I'm sorry if I wasn't clear.

I'm not asking if I can top DPS charts in endgame fights without work. I'm just asking if BLM is the right DPS class for someone who gets easily overwhelmed by too many skills/too much micromanagement. I don't really want to be top DPS. I just want to not be useless.

(So far, the most helpful answer has been that BRD would be better for my needs, though I heard they have a lot of DOTs to manage at 50?)

I know nothing of BLM so I won't speak of that class, as everyone else seems to have already beaten it to death.
Now let's answer this question of whether BRD would be better for you or not. Seeing as you already played DRG, if you can manage DRG's DoTs and Buffs/Debuffs fairly well, then BRD won't be any harder.
Compared to DRG, BRD has no positionals, the DoTs has a moderately long timer (16-18 secs I believe). BRD only has two DoTs and one buff you need to manage, thats a fairly small number.
Windbite and Venomous Bite are the two DoTs, and you have Straight Shot as your buff.
You have a load of oGCD skills in your arsenal so you will weave those in to your rotation as you see fit. BRD has a ton of offensive cooldowns from cross classes, You have Internal Release(MNK), Blood for Blood (DRG), Raging Strikes (BRD), Hawk's Eye (BRD), Barrage (BRD).
Your DoTs are affected by your buffs so you'd probably want to pop all of these at the beginning of any fight, and DoT immediately after. After that, pop them as necessary.
BRD is priority-based class, so here's the run down.
Straight Shot Active? Yes, then DoT, if not refresh Straight Shot.
Windbite still active? Yes, then move on to Venomous Bite, if not renew it.
Venomous Bite Still active? Yes, then move on to Heavy Shot, if not renew it.
All of the above conditions met? Spam Heavy Shot.
Straighter Shot proc?
Do DoTs need renewing? If not, use the Straighter Shot Proc.
and repeat as necessary.
Last, but not least, you have BRD's song. These are situational and you have to kind of learn when to use them. Foe's Requiem when you have casters in the team. Mage's Ballad when your healer need MP. Army's Paeon when your Melees need TP.
If there's a burn phase in the fight, save your MP til that phase and pop Foe's Requiem for your caster. If no burn phase, then pop whatever is necessary for the situation.
And that's your BRD in a nutshell.