I suspect that most people find it more beneficial to determine what your carbohydrate/insulin ratio is to balance food and insulin more precisely.
I recall the sliding scale from the 1980s but, when I used to party a lot, it occurred to me that one could use insulin like something one bought in the parking lot at a Grateful Dead concert. I didn't learn about actually figuring out a ratio for like 20 years of just eyeballing stuff and correcting and re-correcting but counting carbs and getting a ratio when I got my pump made everything fall into place.
"Think Like a Pancreas" by Gary Scheiner or "Your Diabetes Science Experiment" by Ginger Vieira or "Using Insulin" by John Walsh all are excellent primers that take you step by step through the process of figuring this out. If your doc can't help you get oriented in that direction, maybe it's time to find a doctor who can?