Mine is probably in use for around 80% of my waking hours mon-fri.
It acts as my satnav and it will probably take me 3-4different ways to work over a 2 week period and saves me hours of traffic. TA on the radio is no substitute for this. While it's doing that it also doubles as my DAB radio (via the internet).
At work, I manage a team of 6 (8 by Monday) who are often in 4-5 different places at the same time. I also need to be able to talk to a number of other people so I probably make/receive 2hrs of calls a day, plus texts and reading email when in not at my desk.
At home I usually use it to browse the forums I'm a member of and read the news. It also casts my music to my Sonos.
Addicted? No, no more than I'm addicted to my car, or washing machine, or push fit plumbing, or my dishwasher. They're all tools which make my life easier. I will use them as long as they continue to do that.