I don’t see in those links any mention of opinion, it’s not even a synonym.
Are those two expression totally different and what is the difference? What about to use “to my taste” metaphorically for the same meaning as “in my opinion”?
Ideally, one’s taste and one’s opinion can be two different things.
It may suit your taste to have cigars after dinner, for example, but your opinion might be that cigars should not be smoked at all for health reasons or consideration for others, etc. And yet, being human, you might lapse from that behavior even though your opinion about it might remain the same.