Yes, the new missions now have a Delta-V of something like 11 kilometers per second, which is insane. For instance, the New Horizons which only took 9 years to get to Pluto had thrusters with a Delta-V of only like 0.27 kilometers per second, so most of the trip was done using gravity assists. Missions now can do some crazy things like orbit two separate bodies.

To put it into perspective, Voyager 1 has a current speed of 17 kilometers per second. So the Dawn craft has most of that trip covered without gravity assists if it wanted. AFAIK there's nothing stopping us from loading up some craft with more fuel and larger ion engines except for launch weight. And even then, if we mastered orbital refueling we could surpass that.

As it stands, the craft can carry approximately the same amount of Delta-V that the rocket that got it into space. Equivalent to tons of fuel from chemical rockets.