I've seen 3 since I've been back, and I've only been back about a month. So they seem to be happening more often.
Two were PVP tournaments, and one was some n00b event where you rolled a new gnome or something.
About a week after I started playing again I took my druid over to OOT to the Seafury island to knock the rust off of him. While I was there, a GM suddenly showed up and asked if I would like some milk and cookies. I accepted and thanked him and he disapeared. It suprised me as I've rarely even seen any GM's in game lately, even before my break.
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Some people are like slinkies, they aren't really good for anything, but they still bring a smile to your face when you push them down the stairs.