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I use them a fair bit. Enough that I released a set of them on my site ( http://www.addedbytes.com/cheat-sheets/ ) and then made a site for other people to build them ( http://www.cheatography.com/ ). :)

Certainly not a sign of ineptitude. For me, they just save me the time it takes to go to a manual to look something up. I've got a couple on my desk at the moment, for SVN (weening myself off GUI tools) and one for VI.

I don't use printed ones, but I do maintain a personal wiki where I keep all of my documentation over the years. It's extremely useful to be able to search my cheat sheets across my history.

i am faster with google. There is no Ctrl+F on a printed cheatsheet. Looking things up is no sign of ineptitude, nobody can remember everything. The question is how to look things up most efficient.

Whatever I learn I keep using them often, making a habit.

Ask HN: Using Cheat Sheets