We have been married for 64 years. We are both "critical thinkers" and guess who each of us tends to be critical of. Right, not so much each other as each other's ideas, statements and decisions. Being critical thinkers in a marriage can lead to disagreements. Naturally and intelligently, we tend to see things differently. We estimate probabilities differently, consequences differently and the value of consequences differently.
I think it is definitely true that we love each other. We do value our differences, even if my partner tends to be right, correct, more than 50% of the time.
I am impressed at our ability and efforts to keep our affections and admiration for each other. A soft voice, a smile goes a long way to put us back together after disagreement.