I used to thing c++/rust was bad. Then I did some FPGA work and it was quite painful waiting for rebuilds :) . I even appreciated c++/rust build times a bit more after that. Waiting an hour before being able to test your code will definitely make you cognizant of dotting your i's and crossing your t's in new code. We had a design that filled almost 80% of the chip and had pretty strict timing (near the limit of the chip) and it took it quite a while for the fitter to meet the timing requirements.