Seems to me like you guys would prefer to be playing a system that didn't use stats at all. This may be one of the core issues of your dislike.
That's a very strange, and very incorrect, conclusion to draw.
I like ability scores being funneled into a smaller number of easy to remember stats that actually get used frequently in combat. Simplifying the frequent events (attack resolution during combat), even if it adds a little complexity to infrequent events (character creation/leveling) is a good thing.
And you're back to my original point. No one's giving you ADDITIONAL stuff to track. You still have those same six numbers on your sheet. Now you just don't have three more derived defense stats.
4E: Attempt to mentally track AC, Reflex, Fortitude, Will, Attack/Damage bonuses (6 stats), use them frequently each combat. Write ability scores on sheet, reference maybe once a session, if that.
5E: Attempt to mentally track AC, STR, CON, DEX, INT, WIS, CHA, Attack/Damage bonuses (9 stats), use them frequently each combat.
Do you not see the difference? In 4E, I don't "track" the ability scores any more than I "track" each individual skill bonus. They're on the sheet if I need them. I have no real need to remember them during play. Writing stuff on a sheet is easy. The difference between writing down 7 numbers and 10 numbers is trivial. The difference between remembering 6 numbers, and 9 numbers, is more significant.