Possible disconnecting fittings/methods that aren't un-threading the pipe-threaded (and PTFE taped) joints:
Male and Female GHT (garden hose thread) fittings permanently (pipe doped) to other components such as hose barbs, filters, valves... usually these are GHT to NPT (National Pipe Thread) in various configurations.
-just disconnect like any other garden hose device
Cam-Lock fittings, available as small as 3/4" which is suitable for a garden hose, and much larger... used on large scale irrigation with rigid pipes, lots of industrial stuff... Usually available with NPT threads, but also in hose barb configurations, which can connect directly to hose or plastic irrigation pipe.
-fittings push together and two cam levers lock the joint closed
Pipe Unions, available in every plumbing material and configuration (iron, brass, copper, stainless, PVC... threaded, solder, solvent weld) made for disconnectable plumbing connections where an appliance might need changing, or connecting two pipes when you can't spin one or both in order to thread them together.
- tighten/remove using two pipe wrenches or pump pliers.
Hose Barbs with Hose Clamps. possibly how your irrigation system is put together in some places already. Can be a pain to get loose, especially in the cold, so a torch or heat gun is a help to soften the plastic piping or rubber hose a bit. Once a year, not a big deal, any more frequently - find another way.
- tighten/loosen clamps with a screwdriver and wiggle and pull the hose free
- an alternative idea might be to have a very short section of hose/pipe between two barb fittings that is sacrificial (replaced at the start of each season) that can just be cut through to separate the system quickly (like JUST before a hard frost... but who would wait until
then?! 
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