In Q Who
it was stated the Enterprise had been sent 7,000 light years away from the edge of Federation Space. They also said it would take them two years and seven months to get back.
So... Voyager was much slower than the old Enterprise? It should have only taken 30 years.
Actually, it is said that the Enterprise was 7000 ly from where it was previously, not the edge of Fed space. The edge of Fed space could be closer than the original position.
As for Janeway, she would have had a much shorter trip if she'd headed for the Bojaran wormhole.