Yes, there is butter that is like a bland grease block. Then there is stuff like Irish butter that has noticeable, variable, taste. The emulsion from high quality butter is silky smooth, creamy, and surprising light on the tongue, as opposed to leaving a greasy coating on it. The emulsion holds better as the butter melts, with better butter. The way it softens differs in ways that make it nice to cook, and bake, with. It spreads much more nicely. There really is a major difference between industrial production butter, and butter from a real creamery.
I highly suggest you get some huge corp butter, from a big box grocer, and a block of butter from a quality creamery, and then compare them. You will instantly notice the difference. Melt some of each, cook with some of each, spread some of each on some good bread, have toast with each, etc. It will be the whole experience that has improved, not just the taste.
The US has built its empire on convenience. There's plenty of solid brands out there, but the biggest and well known are the companies that cut corners and quantity so they can keep prices low. And us US citizens just eat that shit up.
Amish style butter is some of the best butter I've ever had. You can find it all over the place in the Midwest and Amish heavy states.
Being an American I would implore other Americans to make their own butter at home at least once to know just how much better it is. Then imagine that being done with quality milk. That's what these folks are talking about.
It is most likely because you didn't have the additives, and machines, to get a significantly lower fat butter to fully emulsify.
I have been making more butter myself, and working on cheese now. There are a bunch of farms, in every state, that will sell raw milk "for animal use". I have bought this, and the ultra pasteurized stuff, as I learn how to make cheese. The raw milk makes a noticeable difference in flavor when everything else was identical.