My first computer, an IBM PCjr, did not come with a numpad. It also did not come with a mouse. It was already a pretty old computer when my family got it. I noticed other computers I'd seen came with a mouse and their keyboards had more keys and didn't need batteries because they used a cord. I was really, really jealous of people who had computers with such luxuries.
Our next computer, a 386 Packard Bell, oh joy, DID come with a mouse and a full 101-key wired keyboard. Ever since the Packard Bell I used the number pad exclusively for numbers.
Actually, not until my first laptop, a Dell Latitude LX, did I start to use the other number keys. It wasn't until many years of laptop use later that I became proficient.
I am still way, way, way faster at 10-key on the numpad. This was only reinforced when data entry became a daily part of my job for a few years. Entering ten digit invoice IDs an hour a day will do that.
I like having the numpad when I need it. I can really fly on it when the job calls for it.