Indeed, I had the same experience as you on public transport (and alas 13 years in, still am experiencing it), minus the cancelled trains. TFL tube has had cancellations, but not to the same level. On the flip side, standing is about 95% of the time on it.
I would add there is also the added worry of being mugged or killed. On the bus I take to my station, a guy was murdered by a recently released mental patient. Out of the blue, guy coming back from his commute, just like that. Guy sat behind the victim, and slit his throat because "the voices told him to". Didn't even say anything. I have to say I got quite nervous after that, especially when people sat behind me. Ignoring the bombings and other attacks that hit public transport links too, which didn't help matters.
Then you get all kinds of people, alcoholics, drug users, people who are rude, who spit at you, or just try to get into a fight. On the bus at least there is the driver, and a few times he has stopped the bus and thrown people out, but still a very unpleasant experience. A few times a fist fight would kick off as well, which is always fun, especially if you can't get out of the way in time.
The tube is worse because there is nobody there to deal with problems, and the other passengers will just ignore whatever is happening in the hope they are not next. Your best bet is to avoid anything kicking off before the next station, then get off and hope the other person doesn't follow you. If they do then just make a beeline to one of the security people in the station.
Quite frankly, if I could get a parking spot at work I would switch to a car in a heartbeat. Even sitting in rush hour traffic is better. At least there I am secure in my own little pod, I can turn on the air-con, sit in a comfy seat, put on some nice music on the radio, and chill. Sure it may take longer, but overall the experience is far more pleasant. I didn't originally get why people are willing to waste their time and money in such traffic, but a decade of commuting later (and a short consulting stint where I actually commuted by car) I now fully understand.