Speaking from my own experiences, fiddling and all the different ways/phases I've been working. I think the power is to get the EQ right and to learn how to work with the compressor and dynamic effects. When I started to make music, I kind of just normalized all the tracks, added a general EQ, Compressor and some dynamic effects. Then I routed the tracks to the "after-klang" effects, such as Reverb, Delays, Stereo Imager and a final Compressor. Sure that did work. Later on I had one of the, "okay let's throw all kind of bizarre effects in and see what the mangler will come out with this time", the result was kind of like to throw in buckets of colors in a washing machine and then just trow in a clean white blanket, let it spin around for a while, get out the blanket... Sometimes it was good, while sometimes it was just horrible. Not only was this quite time consuming and lead into a lot of frustrations, but at that time I had NO idea about what mixing was all about. But then started to analyze the music, tried to figure our HOW to reach for a specific sound and not just throw in tons of effects.
What I've come up to is the following:
Play with the EQ to "lift" the soundscape in a channel.
Play with the EQ to get rid of unwanted "muddy" sounds, like disturbing rumbling sounds around 60hz and down.
Play with the compressor to get a better balance.
Go easy on the effects.
Add different reverbs for different purpose, like one for the strings/pads/choirs, one for the drums, one for the lead, and so on.
Also, as mentioned, try and replace a reverb with a delay, multi-tap delay or delay-bank, it can get a more clean and precise effect, than a reverb can do.
The best tool you have are your ears, so use them. and If you want to buy a lot of synths, effects to cover up your work forget about that. Put the money on some good monitors instead, then you can move on
As far as it comes to get that "Dance/Trance" feeling, yeah don't we all want to have that cool sound. I am not a typical dance/trance music maker, but afaik, they tend to work with layers of compressors or Multiband Compressor, to tighten a specific range, and compress and release it just "that" time, to get that pumping effect or gated effect.. Okay this did sound unclear but I don't know how to put it.
Remember this are only thoughts, ideas, tips and tricks from the bag, so to say, so if I am totally out of the blue, let me know