I don't mind telling people when I want to travel. I feel it keeps me safe. However, when it comes to plans, I try not to disclose much because of the reason you mentioned. The moment you get people involved they always have unsolicited advice that often does no good.
It's extra hard for people like me who have a hard time with decision-making. So even though we try to pay deaf ears to the advice they always find a way to get into our heads.
It's easier to just not say anything and leave people wondering.
Yeah you can keep plans to yourself but when you are ready to move then you can tell them about it.