If you are only into gaming, then this does indeed not help much. Actually, the reverse. The 68030 is a much more forgiving processor than the 68040 or 68060. The 68030 can run "blank" (or almost), the 68040 or 68060 need software support and MMU support. It is much harder to keep badly written programs running on 68060 than on the 68030, or games that cannot load the software support packages (aka 68040 or 68060.library).
If you are in programming or software development, then it does make a difference whether a longer project compiles in ten minutes or two.
Also, if you want to run Magic64, then a 68060 is definitely helpful for good performance. If you want to run Mac classic software, a 68040 is probably the most compatible option.
I've had quite a few demos that crawled on my 030 (or didn't run at all) but ran smoothly on my 060, any 3D dwg program (i.e Lightwave, Alladin etc.) is like night and day from 030 to 060, newer (mid-late 90s) games & Nova's ports

need a faster CPU to make them playable.
Basically I love my 030@50 since it's the most forgiving for older classic games and WHDLoad but to compare it performance wise to my CS-MKIII 060@50 or my Apollo 060@50, both not overclocked, is just ridiculous