I started with an HP25 in the 1970s and haven't looked back. I could manipulate it with only my right thumb, but recharging was a pain (LED readout).
Since then, I have used and continue to use HP41s and Swiss Micro clones.
Calculators are what you keep in your shirt pocket on the jobsite, Excel is what you use at your desk.
I quickly found that RPN is, in fact, equivalent to my mental process when doing arithmetic at the job; Excel is when you need to keep a record of entries and results, especially for repeated use of the same functions.
I tried with some success to convert engineers to RPN in the late 1980s: I found that those who stuck with algebraic entry quickly became confused in nested parentheses and were using storage registers (or even written notes) to keep multi-step calculations coherent.
Before the HPs, I had used RPN (before anyone called it that) on desk calculators, and even took a course in formal logic where I learned "forward Polish notation" (aka Ćukasiewicz) for propositional calculus, in place of Russell-Whitehead notation (equivalent to algebraic entry, with parentheses) and its non-typewriter symbols.