in terms of the user fee disussions, i can assure you that even though they can be high in some places (mainly in the form of landing fees), it's in my experience not what breaks the bank...
the fuel cost and therefore also the rental cost (practically all aircraft rent "wet") combined with high fixed costs for annual maintenance, hangar space and insurance plus VAT on everything up to 20% in a lot of countries is what makes up the bigger portion of the costs and GA very expensive.
that's why in some countries mostly the ULM segment seems to thrive.
to me, the biggest hassle about the user fees is having to shut down, get out, pay in one form or another, get back in, restart etc... the time lost, hassle and different procedure everywhere is what is most annoying in my opinion. also, the fact that every landing counts (even missed approaches) is not exactly beneficial to safety/currency/training skills. often this is tried to be offset with special rates for school flights or "pay 1, get all day free" type setups at some fields.
some more recent "harassment" methods against GA have shown up, especially on larger/busier airports. procedures e.g. to require "mandatory handling", which you then must purchase from a choice of companies for essentially no service (other than maybe some security "escort" from/to the airplane), exorbitantly high parking fees if staying for longer than 2 hrs/overnight or a non-monetary one: requiring special permission / passing of online CBTs or even worse flight instructor introductory flights/signoffs within x recent months.
that being said, operating an experimental is significantly cheaper than a certified. also, switzerland is hardly any more expensive overall (surprisingly, as it normally is for most everything else!)
avgas cost is around 8$/gal, VAT is only 8%. a typical landing fee for a 1t airplane about 15$-20$. a typical rental runs around $200-$300/hr.
the whole ATC system is mainly funded by route charges on IFR flights >2t mtom. and sometimes a portion of the landing fee going to ATC depending on airport.
one aspect often overlooked is the cost of medicals, license renewal, forced annual membership fee in the local aeroclub, AIP/approach charts access and sectional charts for every country.
and as an aircraft owner registration/administration fees and radio station license fees. this is the first 1000$ spent annually without having flown a single hour....