Cotter pines is a bit of a set and forget trail, a few good loops but hasnt been worked on in a while, not so much techy stuff more XC, great to ride with kids and good views.
Majura pines is still great (Majurraic park is the jumps park at the bottom on insta)
http://www.majurapines.org/trails/ (a trail day happened a week or two ago, well kept these days by the volunteer crew)
Stromlo, probably hasnt changed much since you were here last, handlebar is the bar down the bottom after your finished.
Carpark is a bit busier as there is a leisure centre part of it now.