I did some playing around with Ilford MGIV neutral and warm tone just recently. I also bought the Ilford's WT developer. I usually use Dektol.

To me the real difference was how well WT combinations took toning. If I tone Sepia or brown, for example, regular paper with Dektol combination produces slight change in color to darkish brownish, purplish, something. Not quite attractive in my mind. When I did the same with WT, it obviously shifted color to warm brown.

I agree with you, without toning, the difference is almost unnoticeable.