I've gotten so used to my car that I can't remember all the things I thought were nifty when I first bought it.

I like the sunshade above the rearview mirror.
I like that I can operate the turn signals, high beam, windshield wiper, and cruise control with the tips of my fingers while my hand is still firmly on the wheel.
I like that the only alert sound the car ever makes is when I leave the key in the ignition or leave the lights on.

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RIP:
2011 E350 BlueTEC, Schwartz 81k (totaled by uninsured drunk driver)
1964 Unimog 404.1 (wrongfully towed by the city)
1994 E320, Brilliantsilber 208k (transmission shuffled off after sudden catastrophic fluid loss)
1982 300D, Silberblau under a blue repaint 256k (sold for parts)
1995 E320 Polarweiss, 131k (sold for parts)
1995 E300D Polarweiss, 287k (totaled by drunk driver)