Non-worthy parents, Mormon or non-Mormon, can't enter the Temple. There is no "wedding" in the Temple, there is a very simple, understated, and brief Sealing ceremony. The Sealing rooms don't hold very many people. Some hold a dozen, some about two dozen at the largest. The Sealing is nothing like a large, traditional wedding that you may be thinking of.
Here's a photo from the LDS Church of one of the Sealing Rooms in the Santiago, Chile Temple.
There's nothing "creepy" about it. Was it "creepy" when the ancient Jews constructed their Tabernacle in the wilderness and limited entry therein? Was it "creepy" when the ancient Jews similarly used Solomon's Temple? Jesus Christ was a Jew and worshipped, taught, etc. in the Temple in Jerusalem. Nothing creepy about it. Entry was limited, especially within the inner walls and the Holy of Holies. Again, nothing creepy about it.