I think most just use or coordinate with their other pulls.
Ours are bigger than 12", so we can grab anywhere. We have 2 integrated custom panel dishwashers, on both sides of our cleanup sink.

We used 12" handles on our DW, our trash cab, and a wide but short cab over our fridge. They seemed to "fit" the doors best. We used 8" handles everywhere else, except for one very small drawer which got a 5" handle.

DW is to left of sink, trash cab (with foot pedal opener) is on the right.

It depends on the style of your pulls and how the rest of your kitchen scales out - I have a 6" pull (to the right of the sink).

We asked our KD--she suggested the same cabinet knobs as elsewhere, not even a smaller version of the appliance handle (e.g., 4")

You can just match to your other pulls. Some have even used knobs without problems (I was going to use a knob to match the drawer on the other side of the sink, but got advice here after doing a mock-up with a knob that the pull just looked better on the big DW panel, while the little knob disappeared).

Here's my yet-to-be-painted incognito dishwasher with glass hexagonal pull:

Francy

We just went with the regular pull too:

{{!gwi}}

We put an 8" pull on. 12" seems like overkill to me

I got a 8" pull for the dishwasher that matched the 4" pulls in the rest of the kitchen (Restoration Hardware Bistro Pulls).

It works great - my KD said she had a regular 4" pull on hers and she has never had a problem with it.

So I don't think those really beefy 12 inch pulls are really necessary if you don't like the look.

I have a cup pull on mine and it works fine, too.

To the left of the sink is a drawer/door, to the right is the same thing simulated for the DW. The 12" pull is for the sake of the DW, matched on the drawer for symmetry. They can also work as towel bars.

Mine is the same as my other cabinets - 5 inches.

{{!gwi}}

I have the same 5+" pulls on my dishdrawers that I have on all my drawers and paneled fridge too.

OP here - thanks to everyone who took the time to answer and even post pix of their beautiful kitchens, it was most helpful.
M.