One of the most important things to understand IMO with this higher dynamic range rendering - whether filmic, ACES or whatever - is that correct PBR based materials and lighting are key components as well. Not enough emphasis is given to that.
'White' needs to have a diffuse value of around 80% for typical surfaces. With that you'll be able to pump up your lighting to more realistic 'sunlight' levels - and therefore get better GI and overall more realistic light interaction. Eg: One dome light, one box with a realistic window sized hole... straight out of the renderer:
I can certainly remember the days when we couldn't even imagine getting a result straight out of the renderer like this. So, whether you choose to use Blender + filmic, or ACES, or whatever - rejoice and be happy : )