Insect are usually encountered at low altitude. No problem when flying high.
Bugs slightly impair cruise speed on a standard GA airfoil, but are definitely a problem with 'laminar' airfoil on gliders, as mentioned by PDR1.
Twice had 'pitot anomaly' occurrences on a light airplane. No problem returning to base with engine parameters and attitude to assess correct AoA on approach. Pretty standard PPL exercice in my country.