I imagine the cylinder on demand will help with resale as your model has the potential to be more efficient on fuel.
I was the same too, thinking "yeah diesels are amazing! I'll deffo get a diesel!!" for the millions of miles I do...... NOT xD I was sent on getting a diesel then after a few discussions and reading about it I've jumped ship and now looking for a petrol as I only do about 10k a year, mostly just to and from work daily which is about 6 miles round trip xD then on weekends to see the parents about an hours drive round the lanes and then a few times a year further ventures into the hundreds of miles.
so like yourself there didn't seem much logic in the diesel as on my daily commutes my 1.5crdi kia rio gets up to temp about 2 mins from work and the same on the way home xD
problem being now there are a lot fewer petrol A4's than diesels xD
my father does has the 1.6tdi a3 and he's never had an issue with the DPF and his journeys are pretty short also to be fair... but for them it's a 30min plod up to town so probably gets just enough to keep things clear