Like you I got used to my paved home runway during training (2500m) but found the transition to grass was a relative non event. The main observation I would make is the apparent difficulty in maintaining a good circuit shape due to the 'softer' visual reference you have from circuit altitude.
A paved runway is hard to miss whereas the grass tends to get absobed into the surrounding countryside making it harder to fly a nice rectangular pattern. The problem disappears once you have done it a few times though.