My love for hardware keyboard started when I was handed an old Nokia communicator for few days during my Symbian dev days for fixing defects in 2007. Think it was the 9300i but not completely sure. Shortly after that I'd another brief encounter with the Nokia E90 for work again. This time it was for few weeks and liked the keyboard a lot. Hated the need to open the phone like a box for the full keyboard but keyboard love was truly up.
My list of phones with hardware keyboards based on ones I used since the E90:
1. Nokia E7 (Was my daily driver and dev phone and preferred this over the N8