I would totally agree with this. I'm far more confident in understanding and explaining the common conditions and treatments seen on my ward than I ever was as a student. Students dive in and out of different placements. One thing I only properly learnt in my second year was that placements are a "Taster" more than a chance to learn absolutely everything about that speciality of nursing.
For the OP directly
@wbnurse - love your enthusiasm, and love that your motivation to learn more is for the end result of better patient care. Two key things for you to learn here, I think, as I was very similar to you.
1) Get good at saying to patients that you don't know the answer. It seems hard at first, as you'll be nervous about the reaction you'll get, but I find patients appreciate your honesty. Promise to find out and get back to them asap - then you learn too.
2) Try and harness your enthusiasm to certain key skills or knowledge you know you need to focus on. It was something a few mentors I think worked on with me as I found by trying to learn everything I spread myself too thin, and subsequently didn't get the depth of knowledge or skills I desired (Or even required).
Just my insights from being in a similar position as you. Take from that what you want. I might be chatting nonsense, and I'm sure other posters will chime in if I am!