No your wrong I have been a healer for a long time infact I beta tested ffxiv and was a healer in ffxi.

As I said not everyone wants to rush. And yes sometimes I have to spam every cool down and heal I got at the same time trying to get mana back.
SCH is the worst with the most mana problems. WHM never seems to run out. But like I said some tanks are lazy and just don't use any mitigation abilities. You can tell when you have a bad tank there like a mana spung and there heal just won't recover.
It's a party system everyone has to be doing there part. Also I hate dps that stands in attacks. First time i get maybe it was a mistake. But when they continue to do it and expect you to just heal there damage take. It's lazy and not my job to heal stupid. No cure for that..