I frequently travel with a pump and it is not much hassle in terms of airport security.
However, there is more stuff to carry than when I was on MDI.
Whilst out and about, it is much less but when you need to consider set changes, the paraphernalia goes up ... and just like when injecting, you need to take twice as much with you than you think you need, just in case.
This does, of course, depend on how often you change your sets. I need to change mine every other day, because the cannula starts to get irritated but I know other people can last four days.
If you can put up with carrying the stuff, I find it much easier to travel, deal with time zone changes, etc. much much easier with a pump. So don't be put off by the stuff.