I agree with Terri & Michael.
I weighed things a lot for about 3 months, but now I do less because I know more what a portion/serving/oz is. When I have doubts or I want to give myself "pop" quizzes, I weigh food. In fact, last week I made a point of weighing & measuring certain foods only for the reason to see how correct I was. I surprised myself at how well I "guestimated" certain items.