The snake temple is one of its kind temple in Malaysia.
I visited this temple when I was a kid. The temple was unchanged but has less snakes now.
If you happened to pass by Bayan Lepas or landed in Penang airport, may be you could stop over for 15 minutes (that would be sufficient).
It was not as interesting as the rat temple in Bikaner (India) or the tiger temple in Thailand. You would be disappointed if you travel thousands of miles just to visit the snake temple in Penang Island.
I wish the Snake Temple will continue to attract more snakes and worshipers.