I usually don't get many visuals at all, but I do get a strong mind trip. Off course you can dose higher, but then I usually find that there are much more interesting things in the trip than visuals, and I end up not paying that much attention to them. You gradually realise that visuals are just one aspect of the psychedelic exprience, and that you can get much more rewarding trips if you go into the experience without expectation.
Having said that, the most visual of the long acting psychedelics I have tried is DOC. For me it was clearly more visual than acid (at a comparable strength trip), and yet a somewhat similar trip all round. The best way to experience visuals for me is to find the right combo at the right dose. Taking ~70 mg of MDMA an hour before a medium dose of acid enhances the visuals and allows me to enjoy them more. 2C-B with LSD also works well. I haven't tried any combo's with DOC yet, but I'm looking forward to trying it with acid. And MDMA. But, like others already have stated, don't trip just for the visuals. Trip for the entire experience, which has a lot to offer.