Dirty little Irish secret: the Cliffs of Moher (CoM) are big cliffs, and are certainly worth a stop for a look if you are nearby. But the CoM are optimized for tour buses, and very much set up for big-time, mass tourism, designed to efficiently process thousands of visitors every day. There are gift shops, plenty of toilets, vast parking areas, and stout, high, idiot-proof guard-rails that will keep even the most determined idiot from inadvertently falling to their death, all very, very safe. Paved concrete walkways everywhere with code-compliant stairways, everything full ADA-compliant (or whatever the EU equivalent is). You might even say "sanitized." All very well set up for large, organized tours and the very large numbers of visitors you will share the experience with. For a tour bus, or folks with significant mobility issues, this is definitely the place to see cliffs.
But there are plenty of other spectacular cliffs you can see around the coasts of Ireland, which are at least as impressive, and in many cases are even more spectacular than the CoM. They're just not set up to efficiently and safely process thousands of visitors every hour. But that's a feature, not a bug.
As luck would have it, some of those cliffs happen to be on Inishmore. These cliffs are "unoptimized", unrefined, unorganized, unsanitized, raw, naked, 100% in their original, unmodified, natural state. They don't have paved parking lots the size of a small city just steps from the cliffs, so yes you'll need to walk a bit (and yes, some of that will be a bit uphill). That walk might be over gravel paths or weird, uneven stoney ground. There will be no guard rails whatsoever, and the very real possibility (certainty, in fact) of falling to a spectacular and grisly death if you don't have enough common sense to avoid stepping over the cliff edge. No toilet facilities. No gift shops. No tour buses. No other tourists or any other people around at all, either -- you'll have these cliffs pretty much, or entirely, to yourself.
We spent 2 nights on Inishmore, and loved everything about the place (well, Fine Dining was not a major highlight, but we didn't expect a Michelin meal). The cliffs on Inishmore were utterly spectacular, one of the highlights of our trip. A couple days later, as we were driving from Galway to Dingle (a long day in the car), we stopped briefly at the Cliffs of Moher. We spent about 10 minutes there, snapped a few photos, enjoyed a break from the long drive (and used their toilets), but honestly, compared to the experience on Inishmore a couple days earlier, I though the CoM were pretty weak tea by comparison. Having the spectacular landscape of Inishmore all to ourselves, not another soul in sight besides my spouse, just the wild, untamed landscape as far as I could see, tinged with mortal danger...by comparison the CoM were a bit....meh. I'm glad we stopped and got out to see them, but the CoM experience paled in comparison to Inishmore.
Others might disagree.
We enjoy exploring small towns, cute shops, music, quaint restaurants and sitting on a bench to soak it all in.
Galway is pleasant enough, and gently ticks all those boxes.
The "town" on Inishmore is extremely small, with limited options. But honestly, I would trade any day in Galway for a day (or another day) on Inishmore. We spent an afternoon (our arrival day) and a morning (our departure day) in Galway, and that seemed about right. We spent almost 3 days on Inishmore (2 nights, one full day and part of two days) and we were very glad we did. We could have easily spent another day there happily but needed to move on to the south (we will go back).
Consider trading some (most?) of your time currently planned for Galway, and spend that on Inishmore. Just keep a step or two back from the edge of those cliffs... ⚠️💀😎