Been using it since 2001 or 2002
It has gotten large. I still use it, but oof. I did the nonstandard 6GB upgrade to my laptop so that I could run Eclipse and do much of anything else at the same time. (Current project is large mixed Java/Scala; much of the oof is the Scala plugin. I grumble, but I would be even sadder without it.)
There are some longstanding issues (structural? architectural?) that I think are a result both of its plugin architecture and open source. The UI and properties settings are a maze of twisty passages; there are features I still have not explored (I am sure). The bug reporting stuff has gotten somewhat better (one of the bugs filed is a bit of a rant from me, on how hard it is to extract relevant configuration information from Eclipse when reporting a bug -- alerts where you cannot cut and paste the text, or that disappear before you can read them, that sort of thing -- they also fixed the bug reporting software's workflow/cueing somewhat).