I actuallly like the new system that much more. Ifrit is fun to run to another person's area and stop to heal them in case they die.. all the while eruptions are going off, etc. Lol it actually makes mages more exciting to me. People that find this a hassle don't work around the "lag" that happens.
Give it a couple more days and people won't be on this anymore. Currently the only problem with spellcasting is sometimes the spells won't start casting at all, which isn't even related to movement. I think it's a glitch in the system.