Well I can't necessarily say which game has gotten the greatest playtime from myself as I have too many games to play currently so I keep bouncing around. For your question regarding twitch shooters and Ghosts feeling too slow, while I do have Ghosts I haven't played a ton. My friend who is pretty big into CoD does enjoy it, and he seemed to like it more than BF4. Myself, I'm a huge BF player, triple dipped on Bad Company 2, double dipped on BF3 (PC and PS3) and put a combined over 430 hours into it. I really like BF4 bugs and all.
If you are playing a game type like Conquest you can definitely run into situations where you may not see people all the time even on a 64 player map. The maps are huge and conquest kind of gives that big battlefield area where skirmishes can occur naturally, but at the same time you may be somewhere off away from a battle. That being said, there are a ton of game types that promote nothing but a fast pace twitch kind of experience.
Rush can be like that, especially on a higher player count server like 42 player or an absolute crazy 64 player Rush. 32 vs 32 trying to attack / defend 2 small points on the map gets nuts. And the layouts do typically allow for multiple paths for attacks so you can still work with flanking manuvers depending on the map. Obliteration also gets fairly intense as everyone is fighting over the single solitary bomb that is always visible on the map.
TDM and Domination resemble CoD quite a bit, smaller map types, infantry only and can still have high player counts all the way up to 64 players. I enjoy all the game types, mostly I have been playing TDM and Domination to work on weapon unlocks myself.
