This is my personal experience, so take it with a grain of salt, but I have used vacation mode for half a month or even an entire month on several occasions (where I land too many large jobs and can’t accept any more) and my Gig conversion doesn’t seem to be affected.
Regarding what you say about it sometimes not working, that may be a misconception. While customers won’t be able to order your Gig ‘on their own’, they will STILL be able to accept Custom Offers while you are in vacation mode under certain circumstances. That’s why I ALWAYS set an Expiration Time on my Custom Offers; because some customer may decide to accept one dating back to 6 months ago just at the right time to completely obliterate my plans. Yes, it has happened to me, and now I’m wiser for it.
Now, about pausing all gigs, personally it terrifies me. I’ve seen a myriad of really bad bugs related to gig editing. But that’s me; someone who has actually done so may be able to shed some light on the wiseness of doing so.