It is def not more taxing than other jobs unless it's very physical. There's a saying in the industry "Hurry up and wait." Most of the time the crew is very active in preparing everything for a scene and they get to sit back and wait for the actors to do their thing while the actual filming is going on. I would say it's probably a 4:1 or 5:1 ratio of time the crew is actively working versus how much time is actually spent with actors actively working. There's a few jobs where you have to work to do a lot of prep and also actively work during the takes (see camera department), but a lot of the time actors are just sitting around waiting in trailers or in a staging area for the crew to set up shots. Also pretty much anyone will tell you that the hardest job on set over the long term is being a grip and/or electric. It's mostly physical labor with all the heaviest, most dangerous pieces of equipment involved in movies (besides prop guns of course smh).