I've just turned on my old Macbook for the first time in a couple years and found that now I have to hold command + Q in order to quit Chrome, whereas I used to be able to just tap it. I prefer the old way. Is there a way to re-enable that?
I've been using macOS since it was called System 6 and with one exception (that I found recently -- Google Chrome!) all you have to do to quit an App is TAP CommandQ. Including the latest macOS on several different Macs.
If you have to hold down that key combo there is either something wrong with your system (maybe even hardware) or there is something installed that could be configured to exhibit that behavior.
Start with logging in as another (new) user, then try a Safe Boot and see if it still behaves that way, and report back.