I travel pretty frequently so I often just call American Express (who acts as a Concur reseller for my company) directly to do the corporate bookings rather than futzing with Concur. I usually find the route I want ahead and then call Amex to price it out/book it. American Express is great — tho my company is big enough to have dedicated CSRs for our account, which helps. Concur is just frustrating.
That said, I will say that the worst parts of Concur are usually employer-made decisions. If your employer has really restrictive travel policies, that makes the Concur experience even worse. For instance, I’ve had the system insist I book an indirect flight that costs more than a direct because of how something is coded, with no way to override. My current employer has very decent travel policies so that’s not an issue, but if it is, it makes the terrible UX and bad search even worse.
And, yeah, if I did more traveling I'd probably just call up our travel agent. But I'd still be on the hook for cash expenses.