And so it added what? 30 seconds to your entrance time? And why should they "care" which x-ray machine you want to go through?
As others have said, I have zero issues with the bag checks and metal detectors. It can be a bit of a pain sometimes, but that is 100% my own doing because we pack a megasized bag that will contain a full dinner for 5, including drinks and dessert, so it can take time to rummage through. However, that's my own choosing to do that. I often apologize in advance to people behind me, because my bag check might take 45 seconds instead of 25. I also agree that if someone really, really wanted to do harm at WDW, they'd find a way. It's not realistic to expect WDW to have fortress like security. If they did, I can only imagine the complaining on these boards and elsewhere about how long it takes to get into the parks. They do their best, I am fairly confident they take security quite seriously.
It's all relative. I live near Six Flags Over Georgia and am ashamed to admit we're AP holders there. The place is a dump. Their attendance is a tiny fraction of what one park at WDW gets, but their security check takes literally 20 minutes to get through on a weekend, if not longer...and it's no more advanced than what WDW does. So I'd say Disney is rather efficient about it.