For me it would have been during 2004/2005 that I first joined up (I was 14), then there was the big forum crash, and on the new forum I was very active (see: annoying), at least through to ~2010 when the Jap car interest started to go crazy.
In 2015 I started building this hatch, so I've been been running my build thread since, with some general activity. The place obviously isn't super active nowadays but it's a marvelous resource still, and much better than Facebook groups with all of their issues caused by hyper-accessibility to only half-interested people.
There are a lot of very good people on this forum, particularly in its strongest era which would be '06 to early teens. Some of my best long term friends are through here... the GMH-Torana forum has served me extremely well.