It took me a long time to discover a meat thermometer. Sheesh! No more cutting into meat to figure out whether it's done or not. The other thing is I pay attention to my grill, how it cooks and estimating time by thickness. I use an infrared grill that does not flare up and leaves the meat juicy. We bought a new one this year and it is so much better than the old one that I limped along for years.
Salmon filets from Costco: 4 minutes per side
Bacon wrapped steaks from Fry's: 5 minutes per side
Frozen hamburger patties: 4.5-5 minutes per side
The new grill does get hot quickly and if I let it go too long, it will quicken the cook times, so it's on me to keep an eye on it.