Hi Pat
Like you and your friend I am not too keen on tunnels either but I have got more used to them over the years. I have been through the St Gotthard Tunnel, c10 miles, twice, once each way. I put a favourite CD on the player and count off the kilometres. The first time we travelled to Italy, including Venice, a delay with a puncture meant that we arrived at the northern entrance to the tunnel at teatime on the last Friday in July. The tunnel queues were pretty horrendous so we decided to try the St Gotthard Pass instead. At that time we had a twin axle Avondale Landranger towed by a Vauxhall Monterey (Isuzu Trooper).
The pass road, which is a turning off the road to the tunnel entrance was a well-surfaced road. It climbed by a series long, not too steep, hairpins to a flat plateau stretch before descending again by further hairpins. Our outfit coped with the Pass with relative ease the engine temperature guage never rose above its normal position - in fact on the descent it showed cooler than usual!! I would unreservedly recommend the St Gotthard Pass as an alternative to the Tunnel. On the way home from Italy the following year our car broke down and had to be relayed home. CC's Red Pennant provided us with a hire tow car but as this was a bit underpowered we decided to travel home via the Brenner Motorway. Again that route was, also, a good one which I would recommend.
On the other hand I would nowsay that the tunnels are not so bad. This year we travelled into Slovenia via the Karwanken Tunnel, another very long one, and there were a number of other, albeit shorter, tunnels in Austria. The Swiss, Austrian and Italian road builders are, understandably, very fond of tunnels and it is hard to avoid them completely as they occur quite frequently on the motorways of those countries.
I hope this helps.