"making copies can take time. drives are pretty large today and it can take a while to zip up your media"
I don't much care, I'd still prefer to wait instead of the hassle that would be caused by taking all the devices away for god knows how long.
Yea, but I think we all know that's not how it would go down:
You: "So, can I have my stuff back? My flight leaves in, like, 20 minutes."
TSA: "Oh yea, Jim's processing it now, shouldn't be more than 5 or 10 minutes."
90 minutes later
You: "OK, well, I already missed my flight, where's my stuff?"
TSA: "Oh, hey, yea, apparently we've decided to hold it indefinitely for further investigation. Now please clear space for the other victims, er, I mean, travelers, before I'm 'forced' to taze your ass."