I love Toystory Land at Hollywood Studios. It is actually one of my favorite themed areas of any Disney World park. But I love walking through it, not actually experiencing the attractions.
Recently, the wait time for only the 2nd rollercoaster at Hollywood Studios boasted a longer than two-hour wait time and I'm going to let you in on a little secret. The ride itself if barely worth standing for an hour.
There are a lot of "Disney blogs" on the internet that will tell you all the great things about every ride but let's be real honest. You could leave your Disney vacation and not partake in several attractions and not have lost any part of your life...or wasted your time. Slinky Dog Dash is one of those.
Here is my best advice for you if you absolutely must ride some of these bigger attractions. Pay for the Genie+ or Lightning Lane options, or get your butt up really early and rope drop the park and run to the attraction. Then you have the rest of the day thinking, "why did I get up so early?"
The ride looks incredibly fun and I will admit it is incredibly smooth but it is not worth long wait times. I liken this ride very closely to the Seven Dwarfs Mine Ride at Magic Kingdom. It's a smooth ride but not worth the wait.
If you want to wait for an attraction that has an enjoyable experience, and provides a lot of integrated decore in the queue lines, go to Animal Kingdom and stand for two hours for Avatar in Pandora.
If you see the Slinky Dog Dash wait time sitting above 60 minutes which is 98% of the time, let others wait and take advantage of the other attractions that might come with much shorter lines.