I had a Travel Time. It was a good looking watch, but the hands had the annoying habit of moving on their own because the buttons would get depressed by accident. It happened often enough that I couldn't trust the time on the watch, which is pretty much a watch's primary function. I ended up selling the watch and got more than I had paid for it (I bought it brand new from an AD.)
Either you had a bad example of a 5134, or you are really tough on your watches? My Dad has never had any problems with his Travel Time with regard to buttons accidentally being depressed. He thinks its one of the better Pateks he has owned. I've handled my Dad's Travel Time and based on button placement and the resistance the buttons have, it would be difficult to accidentally reset the time (at least on his) unless you hit it against something with a pretty good amount of force. Sorry to hear your experience with it wasn't as good as my Dads ownership experience. But as you pointed out, the nice thing is basically any Patek with a complication purchased 10 years ago is worth more than the buyer paid.