I don't know about Wellbutrin but wondering what the half life is; perhaps it is longer and so the symptoms come gradually. I've heard that it is not as hard to get off of as SSRI/SNRIs. It is considered a weak norepinephrine-dopamine reuptake inhibitor so maybe that is one reason why it doesn't wreak as much havoc when coming off. It also appears to have a very small affect on serotonin, another reason it probably isn't so hard to come off.

Good luck - I hope it remains easy!