I'm a bit on the fence when it comes to action economy in 5E myself.
In 3.5, it seemed like the devs just kept adding in things especially for casters. Anyone else remember the high level wizard casting minor, swift and standard action spells? What a mess.
In 4E, many people would sit and think about what they were going to do because they didn't want to "waste" their minor actions.
Along came 5E and, for the most part it's cleaner. Being able to move, do something, and keep moving after doing another action makes so much sense I don't know why I didn't do it as a house rule years ago.
If I had to change anything, I'd change Bonus Actions to Minor Actions and tweak how they work a little bit. Have object interactions be a minor action, allow people to downgrade standard action to move or minor (but don't downgrade move to minor to avoid things like casting a third spell in a round).
I think that would be a cleaner system and allow more flexibility. The name change doesn't really matter much, but to me it's more logical.
I understand why they did it, I just think it's more confusing than necessary.
Overall I still prefer 5E action economy to previous editions, but all systems can be improved.