To keep on top of things, I do a little bit every day. I go to my "Anniversary" list every morning as I drink my cup of coffee. I look at every profile with an anniversary that day and at least review it for typos, bad links, formatting errors. Most days I try to add one fact, improve one source, add and source one relationship collateral to the profile. Then I get on with my day - that job thing, or the main family history project I am working on at the time.
Sometimes these little daily bites remind me again of a whole family line I have been meaning to get back to. Sometimes I find a tangentially related line that has been uploaded but abandoned that turns out to be really, really interesting. But it also means I touch every profile at least once a year, and usually multiple times.