I think it’s saying something about the instant when we formed the opinion, some time in the past. Maybe if the album was open on the table and the photographs were topical, we’d use ‘like’. Of course, I can think of some kind of funny situation where I could use the past tense and literally mean it, intending to communicate that my feelings have changed, but I’d be choosing my words very carefully (using them literally) and breaking with popular idiom.
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