I used to own a 2g handset. I will not mention the brand as this post is not meant to advertise the brand. The reasons for loving it as compared to a smartphone are:
1. Smaller and thus more fitting for the pockets
2. Smaller screen but not cluttered
3. The keypad seemed more responsive
4. The battery could last almost a week before going flat
5. I loved the games that came with it
Of course I acknowledge smartphones have their merits too.