I've got an Opticron MM4 50 travel scope which I keep here in Portugal, a larger, older Opticron scope (can't remember which model) which I keep in UK, and a 40936 SDL v2 eyepiece which is interchangeable between the two. I've got a small Manfrotto carbon fibre tripod with an annoying ball head to use with the travel scope, and a larger tripod with a video head (can't recall the make / models) in UK for the larger tripod.
I keep the small tripod and 'scope in my rucksack when birding the local saltpans, and walk around with binoculars and camera, getting it out to do wader ID and counts on individual tanks - it's absolutely necessary if you're trying to sort out little stints or curlew sandpipers at the far side of a tank, or check out a godwit on the shoreline. The big tripod /'scope combo would be a real pig to carry round, especially when it's hot.
Back in UK, in usually cooler conditions, in coastal habitats I take the 'scope in my ski backpack, with the tripod strapped to the outside using one of the ski holders. I use it for distant waders on the foreshore, and for scanning the sea for divers and sea duck. Because it is heavy, I sometimes leave it behind, and almost always regret doing so. I do sometimes forget to pack my eyepiece when travelling...
It really depends on habitat - I think anyone birding open wetland or coastal habitats is likely to miss out without a 'scope, not just for confirming ID of distant birds, but also just observing birds from well outside their disturbance threshold. There are obvious disadvantages in terms of weight and bulk though, even for a compact travel scope / tripod.
Another disadvantage is simply having too many choices of tool for observing and recording birds...I've sometimes spent too long looking through a 'scope at a bird, when I should've reached for the camera to be able to substantiate a field ID, making the wrong initial choice in the heat of the moment.
So to the OP, my answer is a 'yes', in the right habitat!