You're right: other people made my work possible. They put computers on my desk, paid for (nice) offices, paid the power, air conditioning, water bills, stocked the coffee room, emptied the trash, etc. They also insured the software was licensed, the laser printers were fast, stocked, and maintained. They paid the networking bills, etc. All these things I would have to do myself if I ran my own business, and I could not possibly do them as well and as cost-effectively as people who specialize in that work.

This leads to why small businesses are hard: the owner has to do everything themselves, and at many things, they are bad.

At my current company, I give the car to the free valet in the garage, grab a cup of tea, walk to my desk and sit down and work, without worrying about all the infrastructure stuff.