Going from your 25 year old corolla the biggest thing is probably going to be the tech difference. It might take you a while to get used to it, but you're so going to love the car!
This is not wanting to put the boot into Toyota or my old car - for the most part I have been more than happy with my car. I also realise that many here are upgrading from luxury vehicles so they are used to pretty high standards across EVERYTHING.
But just to give some perspective of the changes I look forward to:
1.) Safety -
driving in wet weather. The Corolla has a tendency to easily loose its grip on the road in wet driving conditions - even with good/new tyres. Obviously, it has no ABS.
2.) Autopilot - even basic
cruise control is non-existent in the Corolla.
3.) Health -
air conditioning. We often felt that we literally got sick when driving long distances in our old car. Admittedly, I never did anything about cleaning the Corolla's ventilation system. Likewise, I got a feeling that some of the manual lever switches/flaps in the ventilation system were no longer fully opening or closing. Hopefully, the Model 3 will be an improvement on this.
4.)
Sound. I did upgrade to a DVD radio on the Corolla, but otherwise never bothered improving sound, even though it is very important to me. Given engine noise, there was little point to spending any serious money on that. Very much looking forward to "studio sound" in the Model 3.
5.) Safety -
air bags. Hopefully never going to need this - a most significant improvement.
6.)
Navigation - look forward not having to fiddle with fiddly smart-phone brackets, cables, etc
7.)
Charging - to me, not having to go to a petrol station is a MAJOR benefit that far outweighs so-called range confidence issues (I might be proven wrong once I actually drive the Model 3)
8.)
Heated seats - I did not even know such a thing existed until I read about it in the context of the Model 3. Shows how much I cared about cars before I heard about the Model 3.
9.)
Beauty in design - flush door handles, aero wheels, direct channelling of water into windscreen wipers, automatic turning on/off of headlights, etc.
10.)
ATARI games - so glad I am around the same age/generation of Elon. The appeal of Nintendo Mario games would have been completely lost on me...