I work in the Private Sector in Film Post-Production and overtime can certainly be quite a sore topic for most people.
First thing is that you are obviously expected to work the hours necessary to get the job done. So chances are you are always going to be working a little bit of what is considered overtime. I'd imagine this is pretty much the case in other Private Sector industries too. I would think it's only Public Sector jobs with the Council or similar where you do a real 9-5 and go home.
In my industry, overtime tends to be based on where you work.
If you work in a post-production facility, i.e. a large company where you are on a permanent contract, they usually don't pay overtime. Instead what they offer is Time In Lieu, so after so many overtime hours worked, you get a half or full day off. The problem with this is that Time In Lieu is always at the employers discretion compared to normal holiday and frankly most people were just never able to take it. Further to this, the department I worked in at one company only awarded Time In Lieu hours for weekend work. There were numerous times where you had to pull an all nighter to get a job finished and our Manager had supposably agreed that we would get Time In Lieu hours for this. It wasn't until the Manager left and they closed the department that HR claimed all the weekday hours people had worked were invalid which led to some very angry people, myself included!
These days I work Freelance or get just hired on for one job with a company. You get treated much better in that respect as you get proper overtime pay, plus time and a half for weekend work. The real difference though is just that you are unlikely to be taking any holiday during the period of that job anyway.
Facilities just take people for granted and they also know that with it being an industry that many want to work in, that they can get away with not paying people for working extra hours. Plus it's not Union protected like the Production (Shooting) side of filmmaking is.