Does seeing your user name listed as the “Last Post” for all the most recent threads give you pause?
Here in MPSIMS, for example, at the time I started writing this, Least Original User Name Ever occupied the top three spots, and five of the top eight. Meanwhile, Kythereia occupied the other three.
I don’t mean to single these two out, as I enjoy sharing the boards with them. I, myself have noticed on occasion that I’ve been the last poster in the top three in a forum.
Do you notice when it’s you?
Do you notice when it’s someone else?
Do you care?
I only care when I am the last poster to a thread, ever. I feel I kill an inordinate amount of threads.
SSG Schwartz
Although I am just getting started here-ditto. Although I am hoping I have just been unluckily getting into threads as they were winding down. I keep telling myself that anyway.
Me too. I’m still trying to determine if it’s me or just my timing.
I don’t usually suck all the oxygen out of a room when I walk in.
Naw. I rarely have more than 4 or 5 posts a day. Some days much more, but some days I can’t find anything I want to bother typing.
I usually open threads in a new tab, and then close the forum. So, I’m sure I do it on occasion, but I don’t care in the least, because I don’t notice.
I know just what you mean. Maybe it’s my wonderful personality. 
I don’t post enough to get bothered by it in the ways suggested by the OP, but I agree with Sgt Schwartz et al about how it can be bothersome to keep killing threads.