I would have agreed with you until I started my own server; run one and you may begin to understand why ops take the precautions they do. It's nothing personal and it (usually) doesn't have to do with an insatiable desire for power and glory either. My advice is to not take offense to being watched on your first stay because it's being done with the best interest of the server in mind. Ops can go overboard sometimes, myself included, but that kind of thing happens when you see the lengths griefers go to and all I can say is sorry.
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Edit: I just found this topic via search http://minecraftforum.net/viewtopic.php?id=826. Might be the best answer we'll get.