Jim,
I haven't used match lines since I started using data driven pages and the grid index tool. It really isn't necessary to and was very time consuming with the way I was doing it. With the grind index tool (toolbox > cartography > data driven pages > grid index features), polygons are made based on size inputs that you specify within the tool. For me, I set the size based on extent of the map and data frame size when in layout view. To figure this out, bring up the data frame properties dialog box, go to the size and position tab, and under "size" you will see the width and height of your data frame that exists on a page. If you have an 8.5 x 11 layout, the size of your data frame will be different than if you are working in an 11 x 17 layout. Basically, it's the size of your data frame in page units (inches).
So once your grid is made, you have several choices of how to display it. I put an inset into the corner of my map, zoom to the extent of the grid index, and with the help of "Definition query" I highlight (for lack of a better word) the page that the person is looking at while the other pages are grayed out (still seen, but, in a sense, transparent). I've included an attachment so you can see what I mean.
Alternatively, you could display the grid index on your map so you can see the bounding lines of the grid (example 2 attached). This one is zoomed out a bit more than the first one, but that's a function that you can set within the "map extent/best fit" within the "setup data driven pages" dialog box.
This may seem like a lot of work to do each time you want to make a map book, but I have templates saved so my width/height is always the same (exceptions between 8.5 x 11 and 11 x 17 layouts). Also, I've used model builder to make a few models that create the grid, assign the size and extent, and even symbolize it for me. I only have 2 inputs, click ok, and my grid is done in seconds.
Let me know if you have any other questions.
Danielle