I wish I could follow a thread and see a view of all activity in threads I follow.
New replies to my posts isn't the same. Just because I answered a question in a thread six months ago, it doesn't mean I want to remain abreast of every post in that thread.
Notify is also not what I need. Besides, there's no view of just threads that I'm notified on. If it was, I would accept the extra email in order to see the threads I want grouped together.