While the the Seven Dwarfs Mine Train attraction doesn't feature a single rider line, it's you're by yourself or have an odd number in your group, you could get put with a stranger.
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At Slinky Dog Dash, there is a Lightning Lane and a Standby Line. There is no Single Rider Line. If you're planning to use the standby line, it's important to get in line at rope drop or ride this one during early entry if possible to avoid a long wait.
The only “pro” of the single rider lines at Disney World is that you'll get on the ride faster. If the wait times were identical, you'd prefer the regular standby line.
There are four rides at Disney World with permanent single rider lines: Rock 'n' Roller Coaster (Hollywood Studios), Millennium Falcon Smugglers Run (Hollywood Studios), Test Track (Epcot), and Expedition Everest (Animal Kingdom).
There are some rides that are less likely to get a single rider line. It wouldn't make as much sense for Space Mountain to get a single rider line, for example, because everyone rides single-file as it is.