I think it depends on the ages of your kids. I often travel alone with my kids and then are 3 and 5 and both are about 42 inches tall. The problem for us is that all of the rides strill require both of my kids to ride with an adult and the cars are not big enough for the three of us to fit. This is a huge problem for us because I am out numbered. I spend most of the day begging total stangers with older kids (that can ride alone or kids together) to ride with one of my kids. Generally I can make it work but it presents lots of issues. So if you have younger or shorter kids and there are more kids than adults, no I don't think it is worth it.
Both my kids like the park and if you ask them it is GREAT. Ask me and I have less positive impressions. If you have at least on adult per kid under 48 inches and between the ages of 3 and 10, they will think it was worth the drive a second time.