it only takes once for us to learn to use it.
I am guilty of not using reraise until about level 43-45. I would only use it on occasion, then my pt and i all took a dive out in Western Altepa. I ended up having to HP after waiting about 20 mins for a friend of mine's party to show up to raise us (they got there in teh same amount of time it took me to hp to jeuno and come back. )
I would suggest for all you melee people out there, if your WHM doesnt have reraise casted on them, ask them to do it, or ask them if they have it. It will save you so much time and energy in the end, and its not even that expensive of a spell. I know you might think, well its not my job to ask another person to do this.. well, if your WHM isnt smart enough to use it like I was, then its probably in your best interest to ask them anyway. If your WHM is dead, you can't be raised, or you have to rely on another party to do it, and its gonna take you so much longer.. etc..