Good point, rising_star, and thanks for sharing your experience. You're right that 'awful' is hard to gauge since it is so subjective and this is a tricky situation...Part of the reason it has been so hard for me to get to this point of considering switching is because my advisor is a genuinely kind and enthusiastic person who has gone through a rough time in his personal life. I have so much sympathy, but I do not know if the personal issues are the cause of these behaviors in communication or if they are inherent. Or perhaps it was also a bad year due to over-scheduling with committees--I don't want to assume anything here. I just know it has been affecting my ability to do my best work from both the extra stress of chasing him down and a lack of reliable critique to engage with. From other students, I know the classroom conduct which certainly is a habit of many years.
However, nobody mentioned difficulties in communication with him when I asked for the dirt during prospective students' day. Everyone spoke so highly of him and focused on his good sense of humor and passion. It was not until I arrived, officially registered and taking classes, that these problems became apparent. Yet everyone made it seem like I could not complain about this to anyone, despite the fact that they too had issues with his teaching style. Perhaps focusing on the positive aspects is how the other students are dealing with this. Or they have a higher tolerance/patience level.
My own experience is that he appears to treat his advisees more as young friends with whom he can spend 6 hours chatting about his favorite topics and takes practical advising duties with a lax attitude. This may be ok for some, but it is driving me insane and I can accept if it's just a difference in personality, as fuzzylogician put it. Some people may not need much advising. I thought I was one of those. I certainly don't expect hand-holding or pats on the head, but this whole process made me realize there are a few basics that need to be covered in order for someone to have the title of advisor. Occasional concrete feedback, syllabi/reliable schedules for courses, and letters of rec when asked are among those for me.
I may have to tweak my research to apply to a different prof (aside from the most logical new advisor in the program--his wife!), but it may be worthwhile if I have my sanity and can at least enjoy the process a bit more.