Similar to word processing tools. A line of text at the bottom like “Selected X lines” can be helpful to determine lengths of notes, phrases or effect commands.
For example I need 8 lines of I10 command to fade in from 0 volume to 7F maximum. Or 12 lines of U10 to glide up an octave. If I can quickly see how many lines of this command I entered, I can fix my errors quicker.