I recently upgraded my phone, and the lack of a 3.5mm jack really hurts. But at least I have an excuse not to listen to my sister's 20 min Whatsapp voice messages...
One other thing I really miss is the LED indicator that you have new notifications when the screen is off.
And for some reason, copying the tapes via a double-deck never worked. I had to use software like Mr. Copy to copy over the tapes I borrowed from a classmate.