I'm a '97 Aero Eng grad - BS and MS. I'm obviously biased, but it is an EXCELLENT program. Compared to EE and ME which graduate +/- 1,000 per year, Aero is pretty cozy at 80-120 a year. This means once past Freshman Engineering (with huge class sizes, TAs and all the engineering programs mixed together) you get LOTS of interaction with the professors and grad students.
Freshman year - by far least enjoyable, huge classes, TAs, many goof offs, schools weeds out the real engineers from the wanna-be's, usually living in the dorms with mix of friends
Sophomore year - begin core program, find yourself spending much more time with smaller group of fellow Aero students
Junior year - is a real crucible, you practically live with your classmates - find somewhere you are comfortable studying (we LIVED at Pappy's and had our own table that was pretty much staffed around the clock ;^), build your core team and lean on each other to get through ... by far the hardest year, but also the most fun
Senior year - really the capstone, enjoy the senior design class, take that really cool controls class you've been putting off, interview like mad and enjoy the year, challenging but workload is much more manageable than Junior year
Along the way, you'll spend plenty of time at games (AHHHH, the smell of stale beer and second hand smoke), enjoy the Chocolate Shop, likely head to Bloomington for the Little 500 and generally enjoy yourself. You will also make life long friendships. Out of my core group of 8 friends, 5 of us have stayed in pretty close contact - we know ech others wives and kids, the whole thing.
I can strongly recommend Purdues program and have stayed close to the school - got my MS there, still see some of the professors once a year, even started a business through the Research Park based on research funded/developed by one of my advisors. The place isn't perfect, but it is great.
Please let me know if you have any questions.