I gotten the glass bug - largely I guess to try something new that wouldn't cost an arm and a leg. Still plenty of decent glass rods at yard sales and such.
I have cane, wood, steel, aluminum, graphite, boron, and glass rods. There are good, bad, and indifferent rods made of each material (OK, the aluminum rods don't stack up too well).
The smooth, slow action of glass is relaxing to me - and many days I go fishing to relax.
The older glass rods fish heavier lines (6 wt to 7 wt) gently, which gives an advantage IMHO over the current approach of fast, lighter (3 wt to 5 wt) lines when distance is an issue, when the wind picks up, or when you have to punch something under a overhanging branch. Heavier lines can be landed gently with a soft action rod. For example, Sunday I was casting an old Heddon 8 1/2' 6 wt rod next to a guy casting the new Loomis 9' 4 wt NFO. The NFO was a rocket, but when the wind came up in our face the lighter 4 wt line folded and the 6 wt still punched out there.