Tbh I totally get the struggle of trying to keep a high-end interior looking fresh without it looking like a work truck. Over the years I've tried many different setups, and you're right, some of those hard plastic liners just feel wrong against that nice wood trim. You don't have to spend a fortune to get the look right tho. Here is what I use to keep things looking clean on a budget:

• Husky Liners X-act Contour Floor Mats Front and Second Row - these are way more flexible than WeatherTech and have a matte rubber finish that blends better with the brown leather.
• Spigen Glas.tR EZ Fit Screen Protector for GMC Sierra 13.4-inch - saves the screen from oily fingerprints for cheap.
• JDMCAR Center Console Organizer for 2024 GMC Sierra 1500 - this one actually has the cutout so it wont block your charger. I usually wait for holiday sales or check for open-box deals on these. Honestly, the Husky liners feel twice as expensive as they actually are... they're much softer under your boots.

^ This. Also, are you mostly worried about the floor area or is the actual leather on the seats the bigger concern? It helps to know if youre hauling kids or dogs daily because that changes the approach. If you just want to keep the brown leather looking factory fresh without covering up that nice stitching, a high-quality sealant is way better than cheap covers. Quick tip: I'd suggest looking into Gtechniq L1 Leather Guard for the seats. It's basically invisible but keeps the mud and rain from soaking in. For the door sills, which always get kicked and scuffed, you can get some clear XPEL Door Sill Guard film. It's cheap and you honestly cant even see it's there once it's on.

Saw this earlier but just getting back to you now. Since you are in Seattle, heavy duty floor coverage is basically mandatory but I totally agree that those hard plastic liners look totally out of place in a Denali. I have been really happy with the TuxMat GMC Sierra 1500 Crew Cab Floor Mats. They have a textured finish that feels more like high-end material than rubber, and the coverage is better than anything else I have tried. It doesnt look cheap at all against the wood trim. Another thing to consider for reliability and safety is the Rough Country Under Seat Storage GMC Sierra 1500. It keeps loose gear from sliding around the cabin when you are hitting the brakes, which is a legit safety risk. It fits perfectly under the rear bench and matches the factory carpet well. Both are solid investments to keep things clean without ruining the vibe tho.