As a non-professional casual programmer I feel this. I can have moments in my life where I'm creating some incredible stuff for myself for work or things at home. Then there's periods of inactivity where I don't use the language. Go back later to add something, do something new, or fix a problem... and now I'm Googling again how the hell to do something that I used to know well. It's like speaking languages, you have to keep up with it or the neurons lose their connections. Usually some of it comes back once I start digging in, but I hate having to relearning stuff. Getting older with memory lapses doesn't help either.