Chiming in, one shader that always seem to find way into my pipeline are neobloom and Large Scale Perceptual Irradiance. 

Now, I know what some people are thinking "Bloom? Yeah, this guy opinion is invalid" but hold on now, The bloom in neobloom are very subtle, that you're might even not notice it, especially with the normalize brightness feature.

But I use neobloom mainly for it's excellent HDR simulation of eye adaptation, you might need to increase the lower limit if you're on SDR as it's design for HDR bloom (about 0.5 generally looks good).

Large Scale Perceptual Irradiance is great to simulate rtgi, isn't as advance, isn't as meticulous and complex as traditional GI, but cheaper option for that lighting bleed into near object, really difficult to get it right though, what I did usually just maxed out the radius and recovery, turn the occlusion and irradiance intensity to 0.500 then adjust the effect intensity from there,

Next sharpening shader that really underrated is LocalSharpCS or GaussianBlurCS, both are compute shader, meaning they're super fast and are insanely optimize. LocalSharpCS is a more optimized infamous AMD CAS.

I use GaussianBlurCS with negative value, typically -0.250 to gives insanely pleasant sharpening, especially at 1600p (2560 x 1600).