I have 4 cats, none of them are declawed. I am strongly opposed to that procedure. I cut my cats' nails every 2 weeks. They are so used to it now that the 4 cats' nails take me less than 10 minutes to cut. I cradle them in my lap, belly side up, and snip away! I started as soon as they came to live with me and they get used to it.
The oldest cat sometimes still attempts to scratch the furniture, but with short nails does not do much damage. I'd still rather buy new furniture than declaw the cats!