Why should you go there and how do you do it right?

Hindu, not Buddhist – and that's precisely what a visit is about. Pattaya's religious life is heavily influenced by the temples (wats), which is why the Kali shrine is somewhat off the beaten path. It's small. You don't need an hour to get there. Instead, you experience a vibrant place of worship, offerings are made, the powerful iconography of the goddess is displayed, and people are there to pray, not to take photos.

I would plan it more as a short stopover than a full-day trip, ideally combined with other sights in the area. It's usually quieter in the morning or early evening. Please note that this is an active shrine and behave accordingly. This means, above all: remain quiet, ask permission before taking photos, and cover your shoulders and knees. If you're interested in Hindu customs in Thailand, it's worth spending half an hour there. If not, you can safely skip it.