Me too. In fact, throw in the expansions and the 10,000 3rd party patches I have amassed over the years and I honestly don't think I need any other synth at all, and I have about 50 of 'em. I love the Repros, Diva, Avenger... even Nexus has its place. So many brilliant synths and sounds in the V Collection. Zebra remainds eternally unused, even though its excellent. I have a ton of NI and Korg synths that see little action, many are fantastic.
Essentially the clue was always in the name. OMNIsphere does it all, pretty much. I love the UX, I get around very quickly. The patch browser is idiosyncratic, but even with its flaws it is by far the best in class out there. For any kind of media work it's almost the only game in town, simply because of its Mood type. Want a hopeful playable soundscape? Press the hopeful tag in Playable Soundscapes. You'll have something in seconds, it will sound incredible. And it's embarrsingly easy to manipulate to make it just right. Sound Match and Sound Lock provide amazing gateways to more variation. With the Orb you can create performable variations. All clicks away.
KVR values absolute sonic purity, and sees no value in patches. If you're not rolling your own, every time, it's postively unethical. Never mind that ever since synths came with presets (circa 1980) musicians have been using them on countless hits, usually just the sound they had in the studio that day. It's how you use the sounds, how you arrange them, that is far more important than oscilloscopes on absolute filter purity.
The HZ Legend has received universal praise here, despite it having a Y2K browser. That deficiency is completely irrelevant for KVR members who always want to roll their own - it's never even discussed. And the sonic purity is second to none. No member of the public could tell the difference when used in a track vs Diva - or indeed Omnisphere.
Every time I read a comment about Omni's UI being "dated" I just laugh. At the coal face getting good work done, it's the fastest way to achieve almost any sonic result (not counting fully acoustic VIs such as violins or guitars).
In short, Omnisphere is for musicians. KVR is for programmers.