I took a break from playing this game to play WoW (where the combat has a 1.5s GCD). When I returned to FFXIV I almost felt like I was lagging in combat due to the differences in GCD time. After playing for a day or so that feeling went away and the combat in FFXIV feels normal again.

I think it just depends on what your used to. I like the combat in FFXIV because it doesn't require break neck reaction times to be proficient. Is it slower than other games...sure; but it still feels fun and enjoyable to me so who cares?