Thanks, changing the labels to text is a big help. I didn't even notice it there in General settings. It still doesn't change the tiny "..." link to a text label (the thing you click on in a message to show previous messages in the conversation). See my other comment here about Fitts' Law.
I use it all the time. I've found that clicking on the previous messages in the conversation view is much slower (requires hitting their servers, which are usually slow). But clicking on the "..." must not require a server hit, because it's instant.