Your belief appears to be that things you have a hard time noticing, like "feel" and "ease of use", are entirely subjective.
That's definitely not true. You not seeing X isn't proof that X doesn't exist. Germs are too small to see, but they matter a great deal.
The same is true of usability. You can definitely measure it. It isn't subjective, but it is personal. Even so, it still matters, because those personal factors have a lot of regularity across individuals that can be exploited. A great example is the iPod. It wasn't the first MP3 player, and it arguably wasn't the best when it came out. But it crushed the existing players because Apple spent a lot of time on making it easy to use and slick.
The amazing thing to me about the iPod isn't that it was better than the competition. It's that the competition never caught up. Precisely because, like you, many of their engineers and executives never took usability seriously.