Depends on the veggies and how much you're eating. Broccoli and green beans have minimal calories, can eat a pound of them for like 100-150 calories. I still count them, but they're pretty miniscule. Things like carrots, corn, peas, etc. actually have some calories in them. I think peas are like 400-500 cals for a pound of them? Not sure exactly.
But yes I would say if you vary your veggies between ones with calories and ones with minimal calories, you should keep at least a rough track similar to what I do. A 300-500 calorie difference between veggies is significant enough in my eyes. Granted, if all you eat is a 8 ounces of broccoli or green beans you could probably get by without counting them. But 16 ounces of carrots or peas or corn I feel should be recorded.
I don't measure exactly, I look at the bag for calories before I cook them then estimate how much I eat (i.e. 1/4, 1/2 of the bag) and use that as my calories consumed.