No.
I truly believe that voice/Siri is a niche feature that hardly anyone uses and will remain so for as long as it exists. Not once have I seen or heard anyone use it. It's an incredibly slow and inefficient way to get things done. Touch and typing is quicker, easier and more reliable, and is possible 100% of the time, whereas Siri is possible only when no-one is near you and where it is quiet.
Handoff could become useful one day, but in its present state, it's far too buggy and slow. Again, though, it's terribly niche. How many people really need to urgently switch from their iPhone to their Mac? Emails and documents get saved automatically anyway; it's not like you save any time. If everything syncs via iCloud, there is no need for the clunkiness of Handoff.
Siri isn't just about dictation though. I'd like Siri to be able to do more things for me. When I'm in my car I'd love to be able to say 'hey Siri, play song [x] from my Spotify playlist. Siri can't do that because there's no 3rd party API. Or when I'm in the car and I ask Siri if the traffic is bad it doesn't tell me, it forces me to unlock my phone and then opens the maps app. How useful is that when driving?!? Why can't Siri tell me traffic looks good or traffic looks bad on [x] highway(s)? Or even better yet how about since my iPhone should know the route I drive to work every morning and about when I leave each day, providing me a notification when traffic is bad and telling me I might want to leave earlier or take a different route. This is about so much more than dictation.
As far as handoff goes I use it a lot (same with AirDrop). I might open a link on my phone, decide it's something I really want to read and use Handoff to pick it up on my iPad. I'd love it if Handoff worked with any app not just Apple ones. You might think it's niche I think it's super convenient.