My Christmas trip has gotten me addicted to slovenly short-term pleasures : I play online poker while watching TV, eating desserts, and drinking booze. Arg, it makes me feel sick, but it feels so good!
Cleverness gets you 99% of the way very quickly. The problem is that when you take the fast clever approach, that last 1% is very difficult. For example, in Physics, you can almost write down the answer to most problems based on symmetry and conservation and knowing the basic terms and proportionalities that must be involved. The trouble with this is that you're missing the constant factor in front, and to get it you've got to go do all the full careful work.