Over the last year i have hired a lot of cars, soem with ABS and some without.
I must say that my braking style completely changed depending if i had it or didnt. One of the cars even had a neat little syste, where if it feels you jumped on the brake in an emergency, it would apply maximum braking for you automatically, which i must say actually worked very well.
Many people i know use ABS asa safety net, ie, you notice your junction is about 5 metres away, so you just stand on the brake as hard as you can in the knowledge you wont skid. Personally, i didnt generally drive like this, but knew it was there if i needed it, and did do a few times.
tbh, even a car with ABS will lock up on ice or bad mud etc, i've had it in for seperate cars, but it does still slow the car down, instead of a complete lock up.
Driving a car without ABS, i tend to drive a little further away from the car in front (i leave a big gap as it is), but i have pretty fat tyres for my car and it takes a hell of a lot of jumping on the brakes to get em to lock on normal dry road conditions.
I can honestly say that i used ABS as a safety net, but not in a dangerous way.
If you have the ability to cadence brake properly, without getting flustered etc, then you would ok without it. If i had the option, i'd probably get it though. I have the ability to stop the car pretty well using cadence braking, but if i was in a situation that flustered me, ie someone jumping out infront of me, it would be nice to have it done for me i guess.
Mal