Playing Civ5 made me realize how tedious combat was in previous Civ games. I think I would actually zone out and just go through the motions until I won the battle (in Civ4, my only thought was how many catapults I'd lose and whether my cities should pump out some more or to go with swordsmen. If I had to, my second thought was which unit I should highlight that would give me the highest percentage kill). One unit per tile has actually made combat fun. It's not a war game, but it's flat out enjoyable. If I want to go back, I'll play Civ4 for the day (then I can go with role playing AI and religions too). Civ5 is a different game and I'm enjoying this change for sure.
I feel the same way. In IV I used to just make stacks of doom and drop em on the closest enemy city. It was kind of a no brainer. Now it's much more tactical. Building the correct units to get the job done. Positioning them just right to take advantage of terrain bonuses etc. It's a much more strategic way of playing, which I enjoy.