Many times, and fortunately it's stupid easy. Syrups are strictly superior to mixing in dry sugar. I've found that darker syrups (use brown sugar) work better in the robust whiskey-based cocktails I favor since they're less sweet and impart some caramel flavor as well. And continuing on that trend, I've pretty much stopped using simple syrup in favor of honey or maple syrup now. Some suggest that you need to dilute it first, but I've had no issues getting it to mix properly straight off the shelf. They're about equal in sweetness to strong simple syrup (so you can get away with using only 1/2 oz), and the extra flavors they bring have (in my experience thus far) been pure upgrade to simple syrup.
My wife and I entertain frequently, and one of the things I most miss from pre-quarantine is the ability to have 40-50 people over to celebrate a birthday, baptism, etc. with good food and top shelf booze. I'm coping by making a shopping list of everything I need to properly fill out my bar so I can make any classic cocktail once things get back to normal.
The bitterness of Campari is definitely an acquired taste. But a Negroni is super refreshing on a hot day once you can appreciate it.
Willet is my go-to sipping Rye. And Bulleit's is probably the best value Rye, so I usually keep a handle on-hand for mixing.
I'll try to catalogue my bottle collection tonight.