What rhino commands do you use on a regular basis and think others don't know about?

[Rhino_Bulgaria (Bobi)]

Not a command, but an important setting instead: Turn off the extrusions! They introduce a bunch of bugs and inconvenience related to the modeling process. Unset the bottom option from this menu.

Just an example:

Wrong origin location of Gumball in Rhino 9 WIP, don't use extrusions!

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More information about other bugs caused by the extrusions, such like the reversed UV direction:

Pipe on circles/arcs/lines

The inconsistent UV direction across different types of geometry was discussed many times during the years. Here is an example: [Inconsistent UV direction]