i did a test and it appears that sometimes views get counted twice, but most of the time they get counted once.
i don't see it as a big deal... i personally don't like the counting feature, with posts or members for that matter... it's a feature that could easily be removed although it does create more hits on the site for a couple reasons:
members will view a thread that has a lot of hits on it out of curiousity... some members are also concerned with having a high post # under their names, therefore they post more replies...
i don't like it because it causes there to be many more short replies to threads... also, we see some members get upset when their thread gets viewed X amount of times and no one replies... the feature's only good purpose is to create more hits IMHO.