Hogwarts is Hogwarts, you get what you get out of it. To me the fun in RP'ing at Hogwarts is starting rivalries with other students, quidditch, hogsmeade trips, making new friends and enemies in the hallways. I always like it better with a no closed thread kind of thing so that anyone can interact at any time. That was what was fun about Hogwarts, you could barge in on someone at a moments notice, you're in a school.
With lots of closed threads it makes the school seem smaller. When anyone could jump into your threads and change the entire outcome, well frankly, that is where the drama comes from. You wont get enemies by asking someone, you get enemies by bothering people IC.
I mean if you have to constantly worry about that troublesome Slytherin always pulling pranks and you can never get peace and quit, that is fun! I never understood closed threads, at all really, and especially at Hogwarts where peace and quiet are not an all too common thing. You shouldn't always interact with just one or two people.
Plus, even during the books, Hogwarts is effected by everything in the adult world. They are supposed to kind of branch off of each other. If it is war time, things should be intense at schools. Students worrying about their parents, about each other, where are the loyalties?
As students you have to kind of make your own adventures. The sky is the limit and the possibilities are endless, you can't say that one thing is hindering the whole process when you have the entire slate right in front of you to go on amazing adventures. I mean you write as children who are literally discovering magical things. They are in a school with floating freaking stairs, how can you not have fun!?!?!
Anyways, main point, Hogwarts is what you make it. Don't limit your ideas and just have a good time.