KITAP is worlds better than KITAS, if you are here for the long haul. Much of the yearly government paperwork goes away permanently (Catatan Sipil, Kantor Lurah, Kecamatan, RT/RW, police visit, trip to Jakarta to deliver papers). The rest moves to a five year interval (driver's license, KanIm). I used to spend so much time on paperwork and without a valid driver's license.
In addition to the time and expense required to keep up with all of that KITAS stuff on a yearly basis, I found it slightly stressful. Ultimately, all those people could cause problems for me in some fashion, either by whim or incompetence, so I prefer to see as little of them as possible (kinda like police).
It is just soooo much better. I'm spending more time living life like a normal person and less time dealing with the unfortunate realities of being a foreigner who is allowed to live here.
I guess the downside I would mention is the hefty cost of the permanent KITAP. Some people don't have 12 jt to plop down on the table (even if it is the last time they will have to pay). Probably not a problem for many, but it must be for some.