If you add a watch for a set variable you by default get the value in dotted display like this:
|MyVar||[firstvalue ... lastvalue]|
Unfortunately this only helps if you know all the values that are between the two given ones. And usually, you don't. (OK, usually I don't, you of course do. ;-) )
There is, however, the undocumented display format modifier "e", that changes this display to much the more convenient:
|MyVar,e||[firstvalue, secondvalue, thirdvalue, lastvalue]|
Now, if only that was the default....