Another little trick is to use a small memory card of just some few gb which only takes a limited number of images – like it was with film. To keep this limitation in mind can contribute to more conscious shooting approach, without imposing too much complication.
The first DSLR I owned was a Canon 300D Digital Rebel. That camera broke new ground with its pricing (something I could afford). During the boxing day sales, I purchased 3 primes, and that became my "kit". I remember one of the first "walkabouts" I did with the kit. I walked for almost 4 hours
through the city, looking at many things, and framing the odd scene. But I took only 4 exposures that day
(and one continues to be a favourite). You'd think I was still carrying my old 4x5 Technika with 2 film holders, back when I didn't have two cents to rub together!
Today, I still take fewer images
than friends who visit the same places with me. However, I'm not so miserly with my exposures
anymore. One advantage of digital (and not worrying about the number of exposures) is that I can take many slight variations of the same subject. If a scene is visually exciting to me, then I'll take quite a few pictures, perhaps bracketing apertures for slightly different DOF, or shifting my perspective a bit this way or that way. I like to "walk into" a scene, exploring new perspectives as I go. In the early days of digital, I often bracketed exposures on bright, contrasty days, with an eye to making sure I had both highlights and shadows captured. But modern sensors have quite good dynamic range, and I do much less of that.
Having said that, it's remarkable how many times it's the first
exposure I take that turns out being the best.