Is /click even useful anymore?

[heffner]

The most important reason is to remove the "time lag" between casts that you get in a /castsequence. There is a lot of information floating around about this. Unless it has been changed? Not to my knowledge though.

Unless of course your /castsequence macros contain a single spell and some spacer commas. It won't make a difference in DPS with these. Wasn't sure if this is what you inferred in your post. If so, then the benefits of /click is basically what everyone else has already said :P

It won't make any difference in DPS if you're using instant cast spells either.