No, it does not matter whether we have been here for a year or a day. Without ALL of us here, the forum wouldn't exist. I will state however that yes, I HAVE seen quitea few comments referring to how long a poster has been here etc. It's irrelevant, but I do think it takes time for each person joining to get a 'feel' of the forum and all it's different individuals.
Come on, in honesty of course there are posters here we like, there are ones we can take or leave, there are one's we don't take to at all - just like real life. It is how we deal with the later that makes the difference between a great place to hang out with other dog owners, and a place that is hurtful and needs escaping from.