[tomahunt]

A medical doctor friend of mine pointed out that thinking slow was fine, except in an emergency or indeed any time--limited situation where the rate of response needs to be above some threshold. Think: baraster responding to opponent, a and e doctor, board-room negotiation etc.

[crehn]

Or when fixing a large production issue at 4:30 AM when you're the only one awake.

[NLips]

My advice (can't remember where this is stolen from) when you need to fix a production issue in a short amount of time:

Don't just do something; sit there!