I am pretty much the same. I even don't go for 3 paged ones because I cannot be bothered reading all of the posts. I will stick with a large thread if I have been there from the early post but other than that I might just post randomly in large threads if I have a sudden urge to post.
So I agree on the large threads being pointless but there are some threads that I post in at other forums that have over 15000 replies and they are fine. It is just like a huge spam thread and can be fun and you don't need to read other peoples posts.

I bet no one read this.