Dude, I've done a lot of these. Dropping FotI on the P2 boss out of habit and being screwed on the adds? Check. Using ALL kicks and stuns before draw power in P1, then sitting there like an idiot while he casts? Check.
Want to know the worst part? On the Draw Power thing... I could have just used Imprison. It would have been fine, and I just never associate Imprison with a kick so I didn't think of it. Was that down for you too, or are you like me and didn't consider it?
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Hahaha, this has happened to me quite a few times too! The WORST part is that you pretty much always take a few seconds to react. It's always "Why am I not gliding what is going on -- oh wait, shit -- okay, dismount" and by the time you glide, you *JUST* miss the platform, and then you have to fall *all* the way down to the water.
Even worse is that your Dalaran hearth is probably down as you JUST hearthed back to town, meaning you've got to run until you hit a zone, use your flight whistle, and take the FP all the way back to Dalaran
Edit: I can't imagine how terrible that must be for somebody without a water-walking mount.