I feel no one has complained about the size yet because it's hard to get a real feel without holding the real thing. Besides, videos dont give a good idea of the true thickness of the device. 19mm is always 2 cm, which is pretty damn thick.
I think the first few months you'll still be carrying some of those extra items: - camera. Need for decent night/flash shots
- tomtom. OVI maps is no where near capable.
- might need to carry an extra battery. Hard to say at the moment