The ideas in Getting Things Done are good, and a bunch of them stuck with me, especially writing everything down and the 2-minute rule. I tried the system, but it dropped off for sure, and I didn’t end up changing how I work.
Mostly the book is a lot of filler: I know an important person that did this, I know an important person that did that. You can take a summary version of it, one of those 5-minute reads, or just Google it, and you’ll get all the information that’s in it. I don’t know that it’s worth reading.