Does it matter if they've output a lot? If you only include studio albums that is
2000 Crush
2002 Bounce
2005 Have A Nice Day
The other projects surely wouldn't have taken as much to put together for the band themselves, and by the time another studio album is released it could be late 2007, so it isn't like they are going mad working. They are obviously happy to do it and enjoy it, so I don't think they 'need' to take a break at all if they don't want to, and I don't know how you think we need a break

No-one forces you to follow their career, to buy their releases and attend their concerts. If you need to take a break from them then it is easy enough to do so, and not suggest they need a break because you're fed up of so many new releases.