No, because for good or bad we never had to deal with this nonsense before, whether it's warranted or not. Walking into a park or monorail without being wanded is what I miss.
I'll fully agree much of this is "security theater" but someone, somewhere thinks these security measures are important (Disney execs, DHS, Wall Street, etc.). I think a lot of it has to do with liability and responsibility if/when something were to happen. If there was no security screenings and an incident were to happen, you can bet everyone (right or wrong) would blame Disney for not doing anything. At least this way, Disney gets to say, at least we tried.
So no, I'm not sure WDW is any safer in 2017 than 1977. No violent attacks then, no violent attacks now. But appearances matter and Disney probably feels doing something is better than nothing.