Hey Adam,
I have pretty much the exact same 'scope as you (8" Sky-Watcher) which I picked up in January. And I'm also viewing from suburbia, Newcastle in my case.
There's heaps to see with the 8" and I've not even scratched the surface. Once I get to some darker skies things will only get better, DSO particularly. Ultimately it all comes down to expectations.
To date I've viewed the 3 planets in good viewing just now, plenty of Open and Globular Clusters (stunning), loads of Double Stars (probably an acquired taste), some Planetary Nebulae (cool but need darker skies I think) and some of the brighter Galaxies (hard to find and a bit dull from light polluted suburbs).
Originally I was a bit disappointed viewing Jupiter at 120x (the 10mm in our case) but then I picked-up a couple of higher power eyepieces to see more detail. Now I check it out all the time for different happenings and appreciated the 120x for its own reasons compared to higher powers.
The biggest factor towards enjoying a night and not getting frustrated I found was making a target plan for the evening based on the conditions, what was up and targeting a specific constellation(s) or target type e.g. an all doubles night. I also go a Telrad which made finding things easier.
There are some great lists around for things to find. I use
Robert Horvarts guides a lot (member here). And decide what to look at by magnitude I know I can see and best time to view.
I'd also recommend checking the collimation of your 'scope asap - I just bought a cheshire and collimated mine for the first time this weekend... much improved seeing.
Hope this helps. Don't be to bummed, you've got as great scope with heaps to work with.
Cheers, Iain