I also spent a good few years commuting with a 75 mile one way commute.
Mine wasnt too bad. Avoided the M25 and was mostly going against the traffic. Podcasts were a saviour and sometimes I miss that long commute. 5am a clear motorway, heated seat, cruise on was lovely. Had the benefit of working at a small airport so parking to crew room was about 10 mins max.
For a few months I even had a 110 mile commute one way. Would do a couple of days drive and couple staying up in hotel depending on roster. It was all motorway and would take around 1 hr 30-1 hr 50.
If any part of your commute involves the M25 forget it.