Typically, you’ll have pipe connectors spaced at intervals along a pipeline. Now you can realign your pipeline by selecting and dragging one or more of the connectors in the pipeline. As you drag a connector around, the pipes adjust, moving around as necessary to stay snapped to the connector. No more manually dragging the pipeline segments to reconnect them every time you reposition a connector.
(No, you might not want to put a pipeline where cars go.)
I don’t know about you, but this enhancement inspired me to write a bad poem:
Once laboriously schlepped
Now know what we want