Should I ask if I visit, and how would you respond?
I treat the Echo the same way. I don't mind if friends have their own preferences when it comes to "smart" things, but I won't indulge their paranoia in my house.
These things have been out for years now, and I've yet to see any evidence that they're always listening or exfiltrating your conversations to HQ. Just vague anecdotes about people seeing ads after they discussed some product, or how their Alexa made a VoIP call by mistake (which, going back to the cell phone analogy, is the same as a butt-dial.)
If you got some particularly sensitive information to talk about, then let's just make sure she's muted for that conversation. I'll do that while you lock your phone to prevent the butt-dial.
https://www.independent.co.uk/life-style/gadgets-and-tech/ne...
https://www.forbes.com/sites/kateoflahertyuk/2019/04/12/amaz...
https://www.washingtonpost.com/gdpr-consent/?destination=%2f...
That said I agree its your home, and me as a potential visitor, will not expect you to disable/enable any devices on my account
Heck you get it even if you don’t buy it. My headphones were software updated with Google Assistant, plus there was the infamous Nest smoke alarm.
And real estate developers have been putting up apartment buildings for at least three years with Alexa built in to the apartments. It's only a matter of time before these "features" are in everyone's homes whether they want them or not.