Yeah, yeah, yeah, forgot about Fireball, much faster than a Shout which needs to cool off. Good tip.
Speaking of blasting stuff, I was playing a PC that was pretty far along (had the Master level destruction spells) and one of the Thieve's Guild (or was it helping the people of Riftin?) quests involved retrieving a stolen horse and the docs that prove something or other. The horse was in the stable and the doc was in a mansion/house outside Riften. After entering, I realized there were tons of mercenaries and, given the enclosed space, I decided to fire off the brand new Master Destruction spell Fire Storm.
BOOM - off it goes, they're on fire, everyone dies.
Interestingly, everything in the house, I mean EVERYTHING, got knocked off it's table/shelf/stand etc. What a mess. The target document fell behind a night stand. The only way to see it was to jump on top of the nightstand and look between the wall and the nightstand. I had to use Telekinesis to reach it. I won't be firing off Fire Storm in a house again.