Filling concrete walls in the basement

I would definitely paint it. The holes don't bother me at all in my storage room, heating cellar, and utility room. My wife, on the other hand, doesn't like it at all. For the part that is supposed to be converted into something like living space later, we also had the walls plastered. There, the holes would probably be too much even for me.

Before:

After:

I would have been very annoyed if I hadn't painted. I don't care about the color and bubbles. The main thing is that it's no longer a dark cave.

2. grind down the entire concrete wall

To keep this under "low effort," you need a sanding giraffe + vacuum. Otherwise, it will get ugly.

I know what I'm talking about, I did everything (=joints) with the angle grinder ;)