I think I am beginning to come to terms with AJAX. Frequent readers know how much I dislike it. Joel Splosky ("Joel On Software") wrote a good piece recently (FogBugz 4 1/2 and Subjective Well-Being) that has helped turn me around, but only slightly. Joel helped me see where my anti-AJAX crusade is unproductive. AJAX does have the right goal in mind, but I still think that it is a poor technique for accomplishing it.
What Joel (rightly) points out is something that I harp on a lot, which is that the user experience is what it is all about. AJAX holds out the promise of much quicker response to user input, which is a prime factor in user satisfaction. AJAX also allows user interactivity that traditional Web applications do not provide, such as drag and drop and right click functionality.
Many AJAX proponents that AJAX is the only way to achieve these goals. I believe that this is incorrect. Remember, the goal is to provide a great user experience. Does drag and drop or right click add much value to the user? Yes, but only for some users. The majority of users do not use drag and drop or right click unless they have been taught to do so in a particular application. Users are timid. They do not try things outside of the ordinary. So to add this functionality is an incredible amount of work for no gain for most users.