There's a certain segment of players that are pretty die-hard about never using Cure and only using Cure 2. If you're on the cutting edge doing Extremes and Savages where you'd really like to min-max your DPS, maybe they're worth listening to.

But in all other content, do what you want. In my experience, the leading cause of White Mages with mana problems is overuse of Cure 2; the runner-up is not casting Regen. For the times when Regen alone isn't cutting it, Cure is great, as it's rate of healing-per-MP is more efficient than Cure 2. If you need to do a bigger heal in time crunch, then Cure 2 is great.

But all of that is just my subjective advice. Don't let others tell you how to play. If you kept your party up, then you're doing a great job, and the rest is icing.