As someone who fits in the middle of both latency groups, I have good days and bad days where AoE is horrible for me or not. Doing Titan the first attempt was a bad day, as every time he landslides anywhere near me I would fly off; even when I was out of it before the cast bar was at 10% complete. Other days I can run out wait til 98% and run back in and not get hit.
I played wow for a long time. Upgrading my computer right before mop came out to a better graphics card (I easily exceed all of FFXIVs min recs) but I never had any issues with AOE there. Nor in RIFT, DC Universe, D&D Online, XI, or a slew of others that I attempted to get into at one point or the other. I'm looking forward to when addons make it, because there is always a "latency fix" I used wow's before the computer change; still did after but it didnt have a noticeable effect.
Wow I ran on high(custom) settings and got anywhere from 35-70fps in average play; 25mans I could tank to 2fps. FFXIV I run at 23-36 fps and yet the aoe and npc/mob load is the worst I've ever seen in any of the games I've played.
Fates are horrible for me, Instances run at 36fps when I remember to check it. the ping to check servers needs to be fixed or they need to accept that the memory has to be larger so that the local client can handle some of the issues (and therefore the ping can also focus on less and succeed more)