Any system of magic can be used in a balanced or an unbalanced way, but some are easier to use in a balanced fashion than others. Yes, there are many modes of magic that can be done in a balanced fashion without getting into ceremonial work, but in some ways it's easier to maintain balance if you have the tools of the ceremonial path available.

As for the long term effects of Enochian magic, I haven't worked with anybody who misused it in a past life, so I don't happen to know!