Aleksey, very true.

I myself use large xterm and putty terminal buffers for being able to go back and recollect something. And by not closing these applications, but rather hibernating the system and reconnecting my sessions so I can even look back at something from the day before, or before the weekend.

I never used screen logging and I can see how that can be useful. However script (in this particular case for documentation) allows you to enable/disable it for certain sessions and log it to separate files easily.