While I agree with everyone's frustrations surrounding population/capacity and creating lag, I think we need to be aware of how lucky we are to have a server like this available.
Don't get me wrong, I'd be a huge advocate for another server, however, I've found that choosing to play during non-peak hours and leveling in the non-traditional path helps make the experience fun and exciting.
If you're unsure what those places are, take Wetlands/Stonetalon/Ashenvale instead of Redridge/Duskwood path. Desolace/Dustwallow instead of STV. The list goes on obviously depending what level, this being from 15 and beyond, but try something new!