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By default, the user line is listed on each line (4 times for an 4 line phone, for example). The workaround is to add presence for a line 3rd line, which the end user may not need, to remove the extra lines. This makes the phone screen very busy when and is not a good user experience when most users only need one line.
The layout can be made much cleaner by logging into the Web UI as Admin and navigate to Utilities -> Line Key Configuration. Highlight the line and change "No. of Line Appearances" to the desired number, which I set to 1.
There should be an option in the portal to better customize the lines on the phones. Coming from a Call Manager background, you should be able to customize the number of lines, line labels, etc without workarounds like adding presence, and having a minimum of three lines show up on your phone instead of 1.