They are one of my favorite trees, though apparently there are people who absolutely hate them. From what I can tell it comes down to whether you have to deal with cleanup, because the flowers can get really sticky and messy after they fall, and there’s always a lot of them.
There’s a residential street near where I used to live that’s completely lined with jacarandas for most of a block. I loved driving or walking along there in April. I wouldn’t want to park there, though!