I moved to be with my husband when he started Primary. I think it was a good decision.
You can make things easier on your husband by taking care of some things for him at home (I personally enjoyed knowing that it was nicer for him to come home with me living there because there was someone outside the military world to talk to, the house was clean, he didn't have to worry about getting groceries, the laundry was taken care of... all these little things that make a difference!)
You can also help your husband study if he needs someone to help him verify he has his procedures memorized.
Your hubby will be busy studying, so you just have to make sure you're understanding. I have a pretty demanding full-time job so we were both busy and I didn't really feel neglected.
Also, think about it this way: yes, he will be busy but you get to see him everyday. It will be far less stressful for him to be able to talk to you even while getting dressed or over a meal, rather than having to dedicate time to a daily phone call if you lived far away. And it isn't bad all the time. My hubby had some times when he was studying non-stop, and other times when he had time to kick back and hang out.
Finally, I can't speak for every pipeline and every situation, but I've found that my hubby's been pretty busy not just through Primary and Advanced. The RAG was pretty demanding of his time, as is the Fleet. I think moving to be with him early (especially if you're married) is a good way to be fully part of his military career, understand everything he's going through, and get used to what flight school is all about.