Honestly after many decades of technological growth, extreme offshoring, and the workforce nearly doubling due to women entering it, I'd estimate that 80% of positions are bullshit jobs.
Doctors do accomplish real work, but I'd say most of their time is wasted - dealing with paperwork and financialization slicing most of their time up into useless 15 minute chunks.
Speaking of the trades though, it's a plain illustration of the dynamic. Simple jobs end up with massive bills these days, and you know the guy doing the actual work isn't seeing much of it. Rather that money is going to the administrators that have congregated around his work - scheduler, billing, manager, owners, insurances, etc etc. So even for a straightforward concrete real-world physical job, there is still a huge amount of overhead!